$name = \"John\"; $alias = &$name; $alias = \"Mike\"; echo $name; \/\/ \u8f93\u51fa \"Mike\"<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0cPHP \u4e2d\u53d8\u91cf\u662f\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u5b58\u50a8\u548c\u64cd\u4f5c\u5404\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5e76\u4e14\u6709\u4e0d\u540c\u7684\u4f5c\u7528\u57df\u548c\u5f15\u7528\u65b9\u5f0f\uff0c\u719f\u7ec3\u638c\u63e1 PHP \u53d8\u91cf\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u57fa\u7840\u8bed\u6cd5\u4e2d\u7684\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
PHP \u662f\u4e00\u79cd\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\uff0c\u53d8\u91cf\u7684\u7c7b\u578b\u5728\u8fd0\u884c\u65f6\u81ea\u52a8\u786e\u5b9a\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u5e38\u89c1\u7684\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n\n\n\n
\n\u5b57\u7b26\u4e32\uff08String\uff09\uff1a\u5b57\u7b26\u4e32\u662f\u4e00\u7ec4\u5b57\u7b26\u5e8f\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u53cc\u5f15\u53f7\u6765\u8868\u793a\u3002\u4f8b\u5982\uff1abashCopy code$name = \"John\"; $message = 'Hello, ' . $name . '!';<\/code><\/li>\n\n\n\n\u6574\u578b\uff08Integer\uff09\uff1a\u6574\u578b\u8868\u793a\u6574\u6570\uff0c\u53ef\u4ee5\u662f\u6b63\u6570\u3001\u8d1f\u6570\u6216\u96f6\u3002\u4f8b\u5982\uff1abashCopy code$age = 30; $distance = -10;<\/code><\/li>\n\n\n\n\u6d6e\u70b9\u578b\uff08Float\uff09\uff1a\u6d6e\u70b9\u578b\u8868\u793a\u5b9e\u6570\uff0c\u5373\u5e26\u6709\u5c0f\u6570\u70b9\u7684\u6570\u503c\u3002\u4f8b\u5982\uff1abashCopy code$price = 99.99; $rate = 3.14159;<\/code><\/li>\n\n\n\n\u5e03\u5c14\u578b\uff08Boolean\uff09\uff1a\u5e03\u5c14\u578b\u8868\u793a\u771f\uff08True\uff09\u6216\u5047\uff08False\uff09\u3002\u4f8b\u5982\uff1abashCopy code$isMarried = true; $isWorking = false;<\/code><\/li>\n\n\n\n\u6570\u7ec4\uff08Array\uff09\uff1a\u6570\u7ec4\u662f\u4e00\u7ec4\u6709\u5e8f\u7684\u503c\uff0c\u6bcf\u4e2a\u503c\u90fd\u6709\u4e00\u4e2a\u5173\u8054\u7684\u952e\u3002\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u6765\u5b58\u50a8\u548c\u64cd\u4f5c\u4e00\u7ec4\u6570\u636e\u3002\u4f8b\u5982\uff1aphpCopy code$fruits = array(\"apple\", \"banana\", \"orange\"); echo $fruits[0]; \/\/ \u8f93\u51fa \"apple\"<\/code><\/li>\n\n\n\n\u5bf9\u8c61\uff08Object\uff09\uff1a\u5bf9\u8c61\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u5b9e\u4f53\uff0c\u5177\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u53ef\u4ee5\u4f7f\u7528\u7c7b\u6765\u5b9a\u4e49\u5bf9\u8c61\uff0c\u4f7f\u7528 new \u5173\u952e\u5b57\u6765\u521b\u5efa\u5bf9\u8c61\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { public $name; public $age; function __construct($name, $age) { $this->name = $name; $this->age = $age; } function getFullName() { return $this->name; } } $person = new Person(\"John\", 30); echo $person->getFullName(); \/\/ \u8f93\u51fa \"John\"<\/code><\/li>\n\n\n\nNULL \u503c\uff08NULL\uff09\uff1aNULL \u503c\u8868\u793a\u53d8\u91cf\u4e0d\u5305\u542b\u4efb\u4f55\u503c\u3002\u4f8b\u5982\uff1aphpCopy code$name = null;<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0cPHP \u4e2d\u6709\u591a\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u6bcf\u79cd\u6570\u636e\u7c7b\u578b\u90fd\u6709\u5176\u7279\u5b9a\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u3002\u719f\u7ec3\u638c\u63e1 PHP \u6570\u636e\u7c7b\u578b\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u57fa\u7840\u8bed\u6cd5\u4e2d\u7684\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
PHP \u4e2d\u7684\u8fd0\u7b97\u7b26\u7528\u4e8e\u5bf9\u53d8\u91cf\u548c\u503c\u8fdb\u884c\u8fd0\u7b97\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u5e38\u89c1\u7684\u8fd0\u7b97\u7b26\uff1a<\/p>\n\n\n\n
\n\u7b97\u672f\u8fd0\u7b97\u7b26\uff1a\u7b97\u672f\u8fd0\u7b97\u7b26\u7528\u4e8e\u6267\u884c\u6570\u5b66\u8fd0\u7b97\u3002\u4f8b\u5982\uff0c+ \u8868\u793a\u52a0\u6cd5\uff0c- \u8868\u793a\u51cf\u6cd5\uff0c* \u8868\u793a\u4e58\u6cd5\uff0c\/ \u8868\u793a\u9664\u6cd5\uff0c% \u8868\u793a\u53d6\u6a21\u8fd0\u7b97\u3002\u4f8b\u5982\uff1aphpCopy code$a = 10; $b = 3; echo $a + $b; \/\/ \u8f93\u51fa 13 echo $a - $b; \/\/ \u8f93\u51fa 7 echo $a * $b; \/\/ \u8f93\u51fa 30 echo $a \/ $b; \/\/ \u8f93\u51fa 3.33333... echo $a % $b; \/\/ \u8f93\u51fa 1<\/code><\/li>\n\n\n\n\u8d4b\u503c\u8fd0\u7b97\u7b26\uff1a\u8d4b\u503c\u8fd0\u7b97\u7b26\u7528\u4e8e\u5c06\u503c\u8d4b\u7ed9\u53d8\u91cf\u3002\u4f8b\u5982\uff0c= \u8868\u793a\u7b80\u5355\u7684\u8d4b\u503c\uff0c+= \u8868\u793a\u52a0\u540e\u8d4b\u503c\uff0c-= \u8868\u793a\u51cf\u540e\u8d4b\u503c\uff0c*= \u8868\u793a\u4e58\u540e\u8d4b\u503c\uff0c\/= \u8868\u793a\u9664\u540e\u8d4b\u503c\u3002\u4f8b\u5982\uff1aperlCopy code$a = 10; $b = 3; $a += $b; \/\/ \u7b49\u4ef7\u4e8e $a = $a + $b; $a -= $b; \/\/ \u7b49\u4ef7\u4e8e $a = $a - $b; $a *= $b; \/\/ \u7b49\u4ef7\u4e8e $a = $a * $b; $a \/= $b; \/\/ \u7b49\u4ef7\u4e8e $a = $a \/ $b;<\/code><\/li>\n\n\n\n\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff1a\u6bd4\u8f83\u8fd0\u7b97\u7b26\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u503c\u3002\u4f8b\u5982\uff0c== \u8868\u793a\u76f8\u7b49\uff0c!= \u8868\u793a\u4e0d\u76f8\u7b49\uff0c< \u8868\u793a\u5c0f\u4e8e\uff0c> \u8868\u793a\u5927\u4e8e\uff0c<= \u8868\u793a\u5c0f\u4e8e\u7b49\u4e8e\uff0c>= \u8868\u793a\u5927\u4e8e\u7b49\u4e8e\u3002\u4f8b\u5982\uff1arubyCopy code$a = 10; $b = 3; var_dump($a == $b); \/\/ \u8f93\u51fa bool(false) var_dump($a != $b); \/\/ \u8f93\u51fa bool(true) var_dump($a < $b); \/\/ \u8f93\u51fa bool(false) var_dump($a > $b); \/\/ \u8f93\u51fa bool(true) var_dump($a <= $b); \/\/ \u8f93\u51fa bool(false) var_dump($a >= $b); \/\/ \u8f93\u51fa bool(true)<\/code><\/li>\n\n\n\n\u903b\u8f91\u8fd0\u7b97\u7b26\uff1a\u903b\u8f91\u8fd0\u7b97\u7b26\u7528\u4e8e\u6267\u884c\u903b\u8f91\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c&& \u8868\u793a\u903b\u8f91\u4e0e\uff0c|| \u8868\u793a\u903b\u8f91\u6216\uff0c! \u8868\u793a\u903b\u8f91\u975e\u3002\u4f8b\u5982\uff1arubyCopy code$a = true; $b = false; var_dump($a && $b); \/\/ \u8f93\u51fa bool(false) var_dump($a || $b); \/\/ \u8f93\u51fa bool(true) var_dump(!$a); \/\/ \u8f93\u51fa bool(false)<\/code><\/li>\n\n\n\n\u4f4d\u8fd0\u7b97\u7b26\uff1a\u4f4d\u8fd0\u7b97\u7b26\u7528\u4e8e\u6267\u884c\u4f4d\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c& \u8868\u793a\u6309\u4f4d\u4e0e\uff0c| \u8868\u793a\u6309\u4f4d\u6216\uff0c~ \u8868\u793a\u6309\u4f4d\u975e\uff0c^ \u8868\u793a\u6309\u4f4d\u5f02\u6216\uff0c<< \u8868\u793a\u5de6\u79fb\u4f4d\u8fd0\u7b97\uff0c>> \u8868\u793a\u53f3\u79fb\u4f4d\u8fd0\u7b97\u3002\u4f8b\u5982\uff1abashCopy code$a = 0b<\/code><\/li>\n<\/ol>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u57fa\u7840\u8bed\u6cd5\u4e2d\u7684\u8868\u8fbe\u5f0f<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u8868\u8fbe\u5f0f\u662f\u7531\u8fd0\u7b97\u7b26\u3001\u53d8\u91cf\u3001\u5e38\u91cf\u548c\u51fd\u6570\u7b49\u7ec4\u6210\u7684\u3002\u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u4e8e\u8ba1\u7b97\u7ed3\u679c\u6216\u8005\u5728\u7a0b\u5e8f\u4e2d\u8fdb\u884c\u903b\u8f91\u5224\u65ad\u7b49\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u5e38\u89c1\u7684\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n
\n\u7b97\u672f\u8868\u8fbe\u5f0f\uff1a\u7b97\u672f\u8868\u8fbe\u5f0f\u4f7f\u7528\u7b97\u672f\u8fd0\u7b97\u7b26\uff08+\u3001-\u3001*\u3001\/\u3001%\uff09\u5bf9\u6570\u503c\u8fdb\u884c\u8ba1\u7b97\u3002\u4f8b\u5982\uff1aperlCopy code$a = 10; $b = 3; $c = $a + $b; \/\/ 13 $d = $a * $b; \/\/ 30 $e = $a % $b; \/\/ 1<\/code><\/li>\n\n\n\n\u903b\u8f91\u8868\u8fbe\u5f0f\uff1a\u903b\u8f91\u8868\u8fbe\u5f0f\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\uff08&&\u3001||\u3001!\uff09\u5bf9\u8868\u8fbe\u5f0f\u8fdb\u884c\u8ba1\u7b97\u3002\u4f8b\u5982\uff1arubyCopy code$a = 10; $b = 3; $c = ($a > $b) && ($a < 20); \/\/ true $d = !($a == $b); \/\/ true<\/code><\/li>\n\n\n\n\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\uff1a\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u4f7f\u7528\u5b57\u7b26\u4e32\u8fde\u63a5\u8fd0\u7b97\u7b26\uff08.\uff09\u5c06\u5b57\u7b26\u4e32\u62fc\u63a5\u5728\u4e00\u8d77\u3002\u4f8b\u5982\uff1aperlCopy code$name = \"John\"; $age = 30; $message = \"My name is \" . $name . \" and I am \" . $age . \" years old.\"; \/\/ \"My name is John and I am 30 years old.\"<\/code><\/li>\n\n\n\n\u6570\u7ec4\u8868\u8fbe\u5f0f\uff1a\u6570\u7ec4\u8868\u8fbe\u5f0f\u7528\u4e8e\u64cd\u4f5c\u6570\u7ec4\uff0c\u5982\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u3001\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20\u7b49\u3002\u4f8b\u5982\uff1aphpCopy code$fruits = array(\"apple\", \"banana\", \"orange\"); $count = count($fruits); \/\/ 3 $first = $fruits[0]; \/\/ \"apple\" $fruits[] = \"grape\"; \/\/ \u5728\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u5143\u7d20 unset($fruits[1]); \/\/ \u5220\u9664\u6570\u7ec4\u4e2d\u7684\u4e00\u4e2a\u5143\u7d20<\/code><\/li>\n\n\n\n\u51fd\u6570\u8868\u8fbe\u5f0f\uff1a\u51fd\u6570\u8868\u8fbe\u5f0f\u7528\u4e8e\u8c03\u7528\u51fd\u6570\uff0c\u5e76\u53ef\u4ee5\u4f20\u9012\u53c2\u6570\u3002\u4f8b\u5982\uff1aperlCopy code$number = 5; $square = pow($number, 2); \/\/ 25 $length = strlen(\"Hello\"); \/\/ 5<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u8868\u8fbe\u5f0f\u662f PHP \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e8e\u6267\u884c\u5404\u79cd\u8fd0\u7b97\u548c\u64cd\u4f5c\uff0c\u4ee5\u53ca\u5728\u7a0b\u5e8f\u4e2d\u8fdb\u884c\u903b\u8f91\u5224\u65ad\u548c\u51fd\u6570\u8c03\u7528\u3002\u719f\u7ec3\u638c\u63e1 PHP \u8868\u8fbe\u5f0f\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u57fa\u7840\u8bed\u6cd5\u4e2d\u7684\u6761\u4ef6\u8bed\u53e5<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u6761\u4ef6\u8bed\u53e5\u7528\u4e8e\u6839\u636e\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u5e38\u89c1\u7684\u6761\u4ef6\u8bed\u53e5\uff1a<\/p>\n\n\n\n
\nif \u8bed\u53e5\uff1aif \u8bed\u53e5\u7528\u4e8e\u5224\u65ad\u67d0\u4e2a\u6761\u4ef6\u662f\u5426\u6210\u7acb\uff0c\u5e76\u6839\u636e\u6761\u4ef6\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002\u4f8b\u5982\uff1abashCopy code$score = 80; if ($score >= 60) { echo \"You passed the exam.\"; } else { echo \"You failed the exam.\"; }<\/code><\/li>\n\n\n\nelseif \u8bed\u53e5\uff1aelseif \u8bed\u53e5\u7528\u4e8e\u5728\u591a\u4e2a\u6761\u4ef6\u4e4b\u95f4\u8fdb\u884c\u5224\u65ad\u3002\u5982\u679c\u524d\u9762\u7684\u6761\u4ef6\u4e0d\u6210\u7acb\uff0c\u5219\u7ee7\u7eed\u5224\u65ad\u4e0b\u4e00\u4e2a\u6761\u4ef6\u3002\u4f8b\u5982\uff1aphpCopy code$score = 80; if ($score >= 90) { echo \"You got an A.\"; } elseif ($score >= 80) { echo \"You got a B.\"; } elseif ($score >= 70) { echo \"You got a C.\"; } elseif ($score >= 60) { echo \"You got a D.\"; } else { echo \"You failed the exam.\"; }<\/code><\/li>\n\n\n\nswitch \u8bed\u53e5\uff1aswitch \u8bed\u53e5\u7528\u4e8e\u5728\u591a\u4e2a\u6761\u4ef6\u4e4b\u95f4\u8fdb\u884c\u5224\u65ad\uff0c\u5e76\u6839\u636e\u6761\u4ef6\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002\u4f8b\u5982\uff1aphpCopy code$day = \"Tuesday\"; switch ($day) { case \"Monday\": echo \"Today is Monday.\"; break; case \"Tuesday\": echo \"Today is Tuesday.\"; break; case \"Wednesday\": echo \"Today is Wednesday.\"; break; default: echo \"Today is not Monday, Tuesday or Wednesday.\"; break; }<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u6761\u4ef6\u8bed\u53e5\u662f PHP \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e8e\u6839\u636e\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\uff0c\u4ece\u800c\u5b9e\u73b0\u7a0b\u5e8f\u7684\u903b\u8f91\u5206\u652f\u63a7\u5236\u3002\u719f\u7ec3\u638c\u63e1 PHP \u6761\u4ef6\u8bed\u53e5\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u57fa\u7840\u8bed\u6cd5\u4e2d\u7684\u5faa\u73af\u8bed\u53e5<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u5faa\u73af\u8bed\u53e5\u7528\u4e8e\u53cd\u590d\u6267\u884c\u67d0\u4e2a\u4ee3\u7801\u5757\uff0c\u76f4\u5230\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\u4e3a\u6b62\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u5e38\u89c1\u7684\u5faa\u73af\u8bed\u53e5\uff1a<\/p>\n\n\n\n
\nwhile \u5faa\u73af\uff1awhile \u5faa\u73af\u7528\u4e8e\u5728\u67d0\u4e2a\u6761\u4ef6\u4e3a\u771f\u65f6\u53cd\u590d\u6267\u884c\u4ee3\u7801\u5757\u3002\u4f8b\u5982\uff1abashCopy code$i = 1; while ($i <= 10) { echo $i; $i++; }<\/code><\/li>\n\n\n\ndo-while \u5faa\u73af\uff1ado-while \u5faa\u73af\u4e0e while \u5faa\u73af\u7c7b\u4f3c\uff0c\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u5148\u6267\u884c\u4e00\u6b21\u4ee3\u7801\u5757\uff0c\u7136\u540e\u518d\u68c0\u67e5\u6761\u4ef6\u662f\u5426\u4e3a\u771f\u3002\u4f8b\u5982\uff1abashCopy code$i = 1; do { echo $i; $i++; } while ($i <= 10);<\/code><\/li>\n\n\n\nfor \u5faa\u73af\uff1afor \u5faa\u73af\u7528\u4e8e\u6307\u5b9a\u4e00\u4e2a\u5faa\u73af\u8ba1\u6570\u5668\u548c\u5faa\u73af\u6761\u4ef6\uff0c\u7136\u540e\u53cd\u590d\u6267\u884c\u4ee3\u7801\u5757\u3002\u4f8b\u5982\uff1abashCopy codefor ($i = 1; $i <= 10; $i++) { echo $i; }<\/code><\/li>\n\n\n\nforeach \u5faa\u73af\uff1aforeach \u5faa\u73af\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u5bf9\u8c61\u4e2d\u7684\u5143\u7d20\uff0c\u5e76\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002\u4f8b\u5982\uff1aphpCopy code$fruits = array(\"apple\", \"banana\", \"orange\"); foreach ($fruits as $fruit) { echo $fruit; }<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5faa\u73af\u8bed\u53e5\u662f PHP \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e8e\u53cd\u590d\u6267\u884c\u67d0\u4e2a\u4ee3\u7801\u5757\uff0c\u4ece\u800c\u5b9e\u73b0\u7a0b\u5e8f\u7684\u91cd\u590d\u903b\u8f91\u3002\u719f\u7ec3\u638c\u63e1 PHP \u5faa\u73af\u8bed\u53e5\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u51fd\u6570<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u51fd\u6570\u662f\u4e00\u6bb5\u5c01\u88c5\u597d\u7684\u53ef\u91cd\u7528\u4ee3\u7801\u5757\uff0c\u5b83\u63a5\u53d7\u8f93\u5165\u53c2\u6570\uff0c\u6267\u884c\u4e00\u5b9a\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u8fd4\u56de\u7ed3\u679c\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u51fd\u6570\u7684\u7279\u70b9\u548c\u7528\u6cd5\uff1a<\/p>\n\n\n\n
\n\u51fd\u6570\u7684\u5b9a\u4e49\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 function<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\u51fd\u6570\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy codefunction functionName($arg1, $arg2, ...) { \/\/ \u51fd\u6570\u4f53 return $result; }<\/code><\/li>\n\n\n\n\u51fd\u6570\u7684\u8c03\u7528\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u540d\u548c\u53c2\u6570\u5217\u8868\u6765\u8c03\u7528\u51fd\u6570\uff0c\u5e76\u83b7\u53d6\u51fd\u6570\u7684\u8fd4\u56de\u503c\u3002\u4f8b\u5982\uff1abashCopy code$result = functionName($arg1, $arg2, ...);<\/code><\/li>\n\n\n\n\u51fd\u6570\u7684\u53c2\u6570\uff1a\u5728 PHP \u4e2d\uff0c\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u96f6\u4e2a\u6216\u591a\u4e2a\u53c2\u6570\uff0c\u53c2\u6570\u53ef\u4ee5\u6709\u9ed8\u8ba4\u503c\uff0c\u4e5f\u53ef\u4ee5\u662f\u53ef\u53d8\u6570\u91cf\u7684\u53c2\u6570\u3002\u4f8b\u5982\uff1aphpCopy codefunction greet($name = \"John\") { echo \"Hello, \" . $name . \"!\"; } greet(); \/\/ \u8f93\u51fa \"Hello, John!\" greet(\"Mary\"); \/\/ \u8f93\u51fa \"Hello, Mary!\"<\/code><\/li>\n\n\n\n\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff1a\u5728 PHP \u4e2d\uff0c\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u503c\u6216\u4e00\u4e2a\u6570\u7ec4\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c\u3002\u4f8b\u5982\uff1aphpCopy codefunction square($num) { return $num * $num; } $result = square(5); \/\/ $result \u7684\u503c\u4e3a 25<\/code><\/li>\n\n\n\n\u51fd\u6570\u7684\u4f5c\u7528\u57df\uff1a\u5728 PHP \u4e2d\uff0c\u51fd\u6570\u6709\u81ea\u5df1\u7684\u4f5c\u7528\u57df\uff0c\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u548c\u8d85\u7ea7\u5168\u5c40\u53d8\u91cf\u3002\u4f8b\u5982\uff1aphpCopy code$x = 10; function increment() { global $x; $x++; } increment(); echo $x; \/\/ \u8f93\u51fa 11<\/code><\/li>\n\n\n\n\u5185\u7f6e\u51fd\u6570\uff1aPHP \u4e2d\u6709\u8bb8\u591a\u5185\u7f6e\u51fd\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u6765\u5b8c\u6210\u4e00\u4e9b\u5e38\u89c1\u7684\u4efb\u52a1\uff0c\u5982\u5b57\u7b26\u4e32\u5904\u7406\u3001\u6570\u7ec4\u64cd\u4f5c\u3001\u65e5\u671f\u548c\u65f6\u95f4\u5904\u7406\u7b49\u3002\u4f8b\u5982\uff1aphpCopy code$str = \"Hello, World!\"; echo strtoupper($str); \/\/ \u8f93\u51fa \"HELLO, WORLD!\" $fruits = array(\"apple\", \"banana\", \"orange\"); echo count($fruits); \/\/ \u8f93\u51fa 3 $date = date(\"Y-m-d H:i:s\"); echo $date; \/\/ \u8f93\u51fa\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u51fd\u6570\u662f PHP \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e8e\u5c01\u88c5\u4ee3\u7801\u3001\u63d0\u9ad8\u4ee3\u7801\u590d\u7528\u6027\u3001\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8bfb\u6027\u3002\u719f\u7ec3\u638c\u63e1 PHP \u51fd\u6570\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u6570\u7ec4<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u6570\u7ec4\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a\u503c\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6216\u5173\u8054\u952e\u6765\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u6570\u7ec4\u7684\u7279\u70b9\u548c\u7528\u6cd5\uff1a<\/p>\n\n\n\n
\n\u6570\u7ec4\u7684\u5b9a\u4e49\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 array<\/code> \u6216 []<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\u6570\u7ec4\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy code$numbers = array(1, 2, 3, 4, 5); $fruits = [\"apple\", \"banana\", \"orange\"]; $person = [ \"name\" => \"John\", \"age\" => 30, \"gender\" => \"male\" ];<\/code><\/li>\n\n\n\n\u6570\u7ec4\u7684\u8bbf\u95ee\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u4e0b\u6807\u6765\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\uff0c\u4e0b\u6807\u53ef\u4ee5\u662f\u6570\u5b57\u6216\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff1aphpCopy codeecho $numbers[0]; \/\/ \u8f93\u51fa 1 echo $fruits[1]; \/\/ \u8f93\u51fa \"banana\" echo $person[\"name\"]; \/\/ \u8f93\u51fa \"John\"<\/code><\/li>\n\n\n\n\u6570\u7ec4\u7684\u904d\u5386\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 foreach<\/code> \u5faa\u73af\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy codeforeach ($numbers as $number) { echo $number; } foreach ($fruits as $index => $fruit) { echo $index . \": \" . $fruit; } foreach ($person as $key => $value) { echo $key . \": \" . $value; }<\/code><\/li>\n\n\n\n\u6570\u7ec4\u7684\u64cd\u4f5c\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u5bf9\u6570\u7ec4\u8fdb\u884c\u6dfb\u52a0\u3001\u5220\u9664\u3001\u5408\u5e76\u3001\u6392\u5e8f\u3001\u8fc7\u6ee4\u7b49\u64cd\u4f5c\u3002\u4f8b\u5982\uff1aphpCopy code\/\/ \u6dfb\u52a0\u5143\u7d20 $fruits[] = \"grape\"; \/\/ \u5220\u9664\u5143\u7d20 unset($fruits[1]); \/\/ \u5408\u5e76\u6570\u7ec4 $colors = [\"red\", \"green\", \"blue\"]; $all = array_merge($fruits, $colors); \/\/ \u6392\u5e8f\u6570\u7ec4 sort($all); \/\/ \u8fc7\u6ee4\u6570\u7ec4 $numbers = [1, 2, 3, 4, 5]; $even = array_filter($numbers, function($n) { return $n % 2 == 0; });<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u6570\u7ec4\u662f PHP \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u672c\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u548c\u64cd\u4f5c\u591a\u4e2a\u503c\uff0c\u4ece\u800c\u5b9e\u73b0\u7a0b\u5e8f\u7684\u590d\u6742\u903b\u8f91\u3002\u719f\u7ec3\u638c\u63e1 PHP \u6570\u7ec4\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u4e2d\u6570\u7ec4\u4ee5\u5916\u7684\u590d\u6742\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
\u9664\u4e86\u6570\u7ec4\u4ee5\u5916\uff0c\u5728 PHP \u4e2d\u8fd8\u6709\u5176\u4ed6\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5982\u5bf9\u8c61\u3001\u8d44\u6e90\u548c\u95ed\u5305\u7b49\u3002\u4ee5\u4e0b\u662f\u5bf9\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff1a<\/p>\n\n\n\n
\n\u5bf9\u8c61\uff1a\u5bf9\u8c61\u662f\u4e00\u79cd\u5c01\u88c5\u4e86\u6570\u636e\u548c\u65b9\u6cd5\u7684\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u57fa\u672c\u5143\u7d20\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 class<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\u7c7b\uff0c\u7136\u540e\u4f7f\u7528 new<\/code> \u5173\u952e\u5b57\u521b\u5efa\u5bf9\u8c61\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { private $name; private $age; public function __construct($name, $age) { $this->name = $name; $this->age = $age; } public function sayHello() { echo \"Hello, my name is \" . $this->name . \" and I am \" . $this->age . \" years old.\"; } } $john = new Person(\"John\", 30); $john->sayHello(); \/\/ \u8f93\u51fa \"Hello, my name is John and I am 30 years old.\"<\/code><\/li>\n\n\n\n\u8d44\u6e90\uff1a\u8d44\u6e90\u662f\u4e00\u79cd\u8868\u793a\u5916\u90e8\u8d44\u6e90\uff08\u5982\u6587\u4ef6\u3001\u6570\u636e\u5e93\u8fde\u63a5\u3001\u56fe\u50cf\u7b49\uff09\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5728 PHP \u4e2d\u4f7f\u7528 resource<\/code> \u7c7b\u578b\u8868\u793a\u3002\u4f8b\u5982\uff1aperlCopy code$file = fopen(\"example.txt\", \"r\"); \/\/ \u5bf9 $file \u8fdb\u884c\u4e00\u4e9b\u64cd\u4f5c fclose($file);<\/code><\/li>\n\n\n\n\u95ed\u5305\uff1a\u95ed\u5305\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u8bbf\u95ee\u5176\u5916\u90e8\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\uff0c\u5e76\u4e14\u5728 PHP \u4e2d\u53ef\u4ee5\u4f7f\u7528 Closure<\/code> \u7c7b\u578b\u8868\u793a\u3002\u4f8b\u5982\uff1aphpCopy code$x = 10; $add = function($y) use ($x) { return $x + $y; }; echo $add(5); \/\/ \u8f93\u51fa 15<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\u9664\u4e86\u6570\u7ec4\u4e4b\u5916\u8fd8\u6709\u5176\u4ed6\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u4eec\u90fd\u6709\u81ea\u5df1\u7684\u7279\u70b9\u548c\u7528\u6cd5\u3002\u719f\u7ec3\u638c\u63e1\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u7684\u4f7f\u7528\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u9762\u5411\u5bf9\u8c61\u7684\u7c7b\u548c\u5bf9\u8c61<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u7f16\u7a0b\u8303\u5f0f\u3002\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u601d\u60f3\u662f\u5c06\u7a0b\u5e8f\u4e2d\u7684\u5b9e\u4f53\u62bd\u8c61\u4e3a\u5bf9\u8c61\uff0c\u901a\u8fc7\u5bf9\u8c61\u4e4b\u95f4\u7684\u4ea4\u4e92\u6765\u5b8c\u6210\u7a0b\u5e8f\u7684\u903b\u8f91\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u57fa\u672c\u8981\u7d20\uff1a<\/p>\n\n\n\n
\n\u7c7b\uff1a\u7c7b\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u5b83\u662f\u4e00\u79cd\u5b9a\u4e49\u5bf9\u8c61\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u84dd\u56fe\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 class<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy codeclass Person { private $name; private $age; public function __construct($name, $age) { $this->name = $name; $this->age = $age; } public function sayHello() { echo \"Hello, my name is \" . $this->name . \" and I am \" . $this->age . \" years old.\"; } }<\/code><\/li>\n\n\n\n\u5bf9\u8c61\uff1a\u5bf9\u8c61\u662f\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5b83\u662f\u5177\u6709\u72b6\u6001\u548c\u884c\u4e3a\u7684\u5b9e\u4f53\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 new<\/code> \u5173\u952e\u5b57\u521b\u5efa\u5bf9\u8c61\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy code$john = new Person(\"John\", 30); $john->sayHello(); \/\/ \u8f93\u51fa \"Hello, my name is John and I am 30 years old.\"<\/code><\/li>\n\n\n\n\u5c5e\u6027\uff1a\u5c5e\u6027\u662f\u7c7b\u4e2d\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u662f\u516c\u5171\u7684\u3001\u79c1\u6709\u7684\u6216\u53d7\u4fdd\u62a4\u7684\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 public<\/code>\u3001private<\/code>\u3001protected<\/code> \u5173\u952e\u5b57\u6765\u58f0\u660e\u5c5e\u6027\uff0c\u5982\u4e0b\u6240\u793a\uff1arubyCopy codeclass Person { public $name; private $age; protected $gender; \/\/ ... }<\/code><\/li>\n\n\n\n\u65b9\u6cd5\uff1a\u65b9\u6cd5\u662f\u7c7b\u4e2d\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u662f\u516c\u5171\u7684\u3001\u79c1\u6709\u7684\u6216\u53d7\u4fdd\u62a4\u7684\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 public<\/code>\u3001private<\/code>\u3001protected<\/code> \u5173\u952e\u5b57\u6765\u58f0\u660e\u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1akotlinCopy codeclass Person { \/\/ ... public function sayHello() { echo \"Hello, my name is \" . $this->name . \" and I am \" . $this->age . \" years old.\"; } }<\/code><\/li>\n\n\n\n\u7ee7\u627f\uff1a\u7ee7\u627f\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u91cd\u8981\u7279\u6027\uff0c\u5b83\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u8be5\u7c7b\u4ece\u53e6\u4e00\u4e2a\u7c7b\u7ee7\u627f\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 extends<\/code> \u5173\u952e\u5b57\u5b9e\u73b0\u7ee7\u627f\uff0c\u5982\u4e0b\u6240\u793a\uff1aphpCopy codeclass Student extends Person { private $grade; public function __construct($name, $age, $grade) { parent::__construct($name, $age); $this->grade = $grade; } public function sayHello() { parent::sayHello(); echo \"I am a student in grade \" . $this->grade . \".\"; } }<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u662f\u975e\u5e38\u91cd\u8981\u7684\u7f16\u7a0b\u8303\u5f0f\u3002\u719f\u7ec3\u638c\u63e1\u7c7b\u3001\u5bf9\u8c61\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u548c\u7ee7\u627f\u7684\u4f7f\u7528\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u7f16\u5199\u66f4\u52a0\u7075\u6d3b\u548c\u53ef\u7ef4\u62a4\u7684 PHP \u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u9762\u5411\u5bf9\u8c61\u7684\u7c7b\u7684\u7ee7\u627f<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u7279\u6027\uff0c\u5b83\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u8be5\u7c7b\u4ece\u53e6\u4e00\u4e2a\u7c7b\u7ee7\u627f\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u7c7b\u7684\u7ee7\u627f\u7684\u57fa\u672c\u8981\u7d20\uff1a<\/p>\n\n\n\n
\n\u5b50\u7c7b\u548c\u7236\u7c7b\uff1a\u5728 PHP \u4e2d\uff0c\u4f7f\u7528 extends<\/code> \u5173\u952e\u5b57\u6765\u5b9e\u73b0\u7c7b\u7684\u7ee7\u627f\uff0c\u5982\u4e0b\u6240\u793a\uff1ajavaCopy codeclass ChildClass extends ParentClass { \/\/ ... } <\/code>\u5728\u8fd9\u91cc\uff0cChildClass<\/code> \u662f\u5b50\u7c7b\uff0cParentClass<\/code> \u662f\u7236\u7c7b\u3002<\/li>\n\n\n\n\u7ee7\u627f\u5c5e\u6027\uff1a\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\u7684\u5c5e\u6027\uff0c\u4f8b\u5982\uff1aphpCopy codeclass Person { public $name; private $age; protected $gender; \/\/ ... } class Student extends Person { private $grade; \/\/ ... } $john = new Student(); $john->name = \"John\"; \/\/ \u53ef\u4ee5\u8bbf\u95ee\u7236\u7c7b\u7684\u516c\u5171\u5c5e\u6027 $john->age = 30; \/\/ \u4e0d\u80fd\u8bbf\u95ee\u7236\u7c7b\u7684\u79c1\u6709\u5c5e\u6027 $john->gender = \"male\"; \/\/ \u4e0d\u80fd\u8bbf\u95ee\u7236\u7c7b\u7684\u53d7\u4fdd\u62a4\u5c5e\u6027<\/code><\/li>\n\n\n\n\u7ee7\u627f\u65b9\u6cd5\uff1a\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\uff08override\uff09\u5b83\u4eec\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { public function sayHello() { echo \"Hello!\"; } } class Student extends Person { public function sayHello() { echo \"Hi, I am a student!\"; } } $john = new Student(); $john->sayHello(); \/\/ \u8f93\u51fa \"Hi, I am a student!\"<\/code><\/li>\n\n\n\n\u8c03\u7528\u7236\u7c7b\u65b9\u6cd5\uff1a\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 parent::<\/code> \u5173\u952e\u5b57\u8c03\u7528\u7236\u7c7b\u7684\u540c\u540d\u65b9\u6cd5\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { public function sayHello() { echo \"Hello!\"; } } class Student extends Person { public function sayHello() { parent::sayHello(); echo \"I am a student.\"; } } $john = new Student(); $john->sayHello(); \/\/ \u8f93\u51fa \"Hello!I am a student.\"<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u7ee7\u627f\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7279\u6027\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\u3001\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002\u719f\u7ec3\u638c\u63e1\u7c7b\u7684\u7ee7\u627f\u7684\u4f7f\u7528\uff0c\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u9762\u5411\u5bf9\u8c61\u7684\u7c7b\u7684\u5c01\u88c5<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u6307\u7684\u662f\u5c06\u6570\u636e\u548c\u65b9\u6cd5\u5c01\u88c5\u5728\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u5e76\u4e14\u5bf9\u5916\u90e8\u8bbf\u95ee\u8fdb\u884c\u63a7\u5236\uff0c\u4ece\u800c\u4fdd\u62a4\u6570\u636e\u548c\u65b9\u6cd5\u7684\u5b89\u5168\u6027\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u7c7b\u7684\u5c01\u88c5\u7684\u57fa\u672c\u8981\u7d20\uff1a<\/p>\n\n\n\n
\n\u8bbf\u95ee\u63a7\u5236\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 public<\/code>\u3001private<\/code> \u548c protected<\/code> \u5173\u952e\u5b57\u6765\u63a7\u5236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u5bf9\u5916\u90e8\u7684\u53ef\u89c1\u6027\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { public $name; \/\/ \u516c\u5171\u5c5e\u6027\uff0c\u4efb\u4f55\u5730\u65b9\u90fd\u53ef\u4ee5\u8bbf\u95ee private $age; \/\/ \u79c1\u6709\u5c5e\u6027\uff0c\u53ea\u6709\u672c\u7c7b\u4e2d\u53ef\u4ee5\u8bbf\u95ee protected $gender; \/\/ \u53d7\u4fdd\u62a4\u5c5e\u6027\uff0c\u53ea\u6709\u672c\u7c7b\u53ca\u5176\u5b50\u7c7b\u53ef\u4ee5\u8bbf\u95ee public function sayHello() { echo \"Hello!\"; } private function sayGoodbye() { echo \"Goodbye!\"; } protected function sayWelcome() { echo \"Welcome!\"; } } $john = new Person(); $john->name = \"John\"; \/\/ \u53ef\u4ee5\u8bbf\u95ee\u516c\u5171\u5c5e\u6027 $john->age = 30; \/\/ \u4e0d\u80fd\u8bbf\u95ee\u79c1\u6709\u5c5e\u6027 $john->gender = \"male\"; \/\/ \u4e0d\u80fd\u8bbf\u95ee\u53d7\u4fdd\u62a4\u5c5e\u6027 $john->sayHello(); \/\/ \u53ef\u4ee5\u8bbf\u95ee\u516c\u5171\u65b9\u6cd5 $john->sayGoodbye(); \/\/ \u4e0d\u80fd\u8bbf\u95ee\u79c1\u6709\u65b9\u6cd5 $john->sayWelcome(); \/\/ \u4e0d\u80fd\u8bbf\u95ee\u53d7\u4fdd\u62a4\u65b9\u6cd5<\/code><\/li>\n\n\n\nGetter \u548c Setter \u65b9\u6cd5\uff1a\u4e3a\u4e86\u8bbf\u95ee\u7c7b\u7684\u79c1\u6709\u5c5e\u6027\uff0c\u53ef\u4ee5\u63d0\u4f9b Getter \u548c Setter \u65b9\u6cd5\uff0c\u4f8b\u5982\uff1aphpCopy codeclass Person { private $age; public function getAge() { return $this->age; } public function setAge($age) { if ($age > 0 && $age < 150) { $this->age = $age; } else { throw new Exception(\"Invalid age!\"); } } } $john = new Person(); $john->setAge(30); echo $john->getAge(); \/\/ \u8f93\u51fa 30<\/code><\/li>\n\n\n\n\u53ea\u8bfb\u5c5e\u6027\uff1a\u6709\u65f6\u5019\u9700\u8981\u5c06\u7c7b\u7684\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u7684\uff0c\u5373\u53ea\u80fd\u5728\u6784\u9020\u51fd\u6570\u4e2d\u521d\u59cb\u5316\uff0c\u5e76\u4e14\u4e0d\u80fd\u88ab\u5916\u90e8\u4fee\u6539\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } $john = new Person(\"John\"); echo $john->getName(); \/\/ \u8f93\u51fa \"John\" $john->name = \"Tom\"; \/\/ \u4e0d\u80fd\u4fee\u6539\u53ea\u8bfb\u5c5e\u6027<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u4fdd\u62a4\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u5e76\u4e14\u63d0\u4f9b\u66f4\u597d\u7684\u5b89\u5168\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u719f\u7ec3\u638c\u63e1\u7c7b\u7684\u5c01\u88c5\u7684\u4f7f\u7528\uff0c\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u4ecb\u7ecdPHP\u9762\u5411\u5bf9\u8c61\u7684\u7c7b\u7684\u591a\u6001<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u591a\u6001\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u6307\u7684\u662f\u540c\u4e00\u4e2a\u7c7b\u7684\u4e0d\u540c\u5bf9\u8c61\uff0c\u8c03\u7528\u540c\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u53ef\u80fd\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u884c\u4e3a\u3002\u4ee5\u4e0b\u662f PHP \u4e2d\u7c7b\u7684\u591a\u6001\u7684\u57fa\u672c\u8981\u7d20\uff1a<\/p>\n\n\n\n
\n\u7ee7\u627f\u548c\u91cd\u5199\uff1a\u5728 PHP \u4e2d\uff0c\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\uff08override\uff09\u5b83\u4eec\u3002\u4f8b\u5982\uff1aphpCopy codeclass Person { public function sayHello() { echo \"Hello!\"; } } class Student extends Person { public function sayHello() { echo \"Hi, I am a student!\"; } } $john = new Student(); $john->sayHello(); \/\/ \u8f93\u51fa \"Hi, I am a student!\"<\/code><\/li>\n\n\n\n\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u6765\u5b9e\u73b0\u591a\u6001\u6027\u3002\u62bd\u8c61\u7c7b\u662f\u4e00\u79cd\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\u7684\u7c7b\uff0c\u5b83\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\uff0c\u5373\u53ea\u6709\u65b9\u6cd5\u7b7e\u540d\uff0c\u6ca1\u6709\u65b9\u6cd5\u4f53\u3002\u800c\u63a5\u53e3\u662f\u4e00\u79cd\u53ea\u5305\u542b\u65b9\u6cd5\u7b7e\u540d\u800c\u6ca1\u6709\u65b9\u6cd5\u4f53\u7684\u7ed3\u6784\u3002\u5b50\u7c7b\u5fc5\u987b\u5b9e\u73b0\u62bd\u8c61\u65b9\u6cd5\u6216\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff1aphpCopy codeabstract class Animal { abstract public function makeSound(); } class Cat extends Animal { public function makeSound() { echo \"Meow!\"; } } interface Movable { public function move(); } class Car implements Movable { public function move() { echo \"The car is moving.\"; } } <\/code>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cAnimal<\/code> \u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5b83\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5 makeSound()<\/code>\uff0c\u5b50\u7c7b\u5fc5\u987b\u5b9e\u73b0\u8fd9\u4e2a\u65b9\u6cd5\u3002Cat<\/code> \u662f Animal<\/code> \u7684\u5b50\u7c7b\uff0c\u5b9e\u73b0\u4e86 makeSound()<\/code> \u65b9\u6cd5\u3002Movable<\/code> \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u6709\u4e00\u4e2a\u65b9\u6cd5 move()<\/code>\uff0c\u5b9e\u73b0\u4e86\u8fd9\u4e2a\u63a5\u53e3\u7684\u7c7b\u5fc5\u987b\u5b9e\u73b0\u8fd9\u4e2a\u65b9\u6cd5\u3002Car<\/code> \u5b9e\u73b0\u4e86 Movable<\/code> \u63a5\u53e3\uff0c\u5e76\u4e14\u5b9e\u73b0\u4e86 move()<\/code> \u65b9\u6cd5\u3002<\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u7c7b\u7684\u591a\u6001\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5b9e\u73b0\u66f4\u52a0\u7075\u6d3b\u548c\u53ef\u6269\u5c55\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u719f\u7ec3\u638c\u63e1\u7c7b\u7684\u591a\u6001\u7684\u4f7f\u7528\uff0c\u662f\u7f16\u5199\u9ad8\u6548 PHP \u5e94\u7528\u7a0b\u5e8f\u7684\u5fc5\u8981\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u89e3\u91caPHP\u548cMySQL\u6570\u636e\u5e93\u7684\u8fde\u63a5<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u4e0e MySQL \u6570\u636e\u5e93\u8fdb\u884c\u8fde\u63a5\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u901a\u5e38\u9700\u8981\u4f7f\u7528 PHP \u63d0\u4f9b\u7684 MySQL \u6269\u5c55\u6765\u5b8c\u6210\u8fde\u63a5\u3002\u4ee5\u4e0b\u662f PHP \u548c MySQL \u6570\u636e\u5e93\u8fde\u63a5\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n\n\n\n
\n\u914d\u7f6e MySQL \u6570\u636e\u5e93\u4fe1\u606f\uff1a\u5728 PHP \u4ee3\u7801\u4e2d\uff0c\u9700\u8981\u5148\u914d\u7f6e MySQL \u6570\u636e\u5e93\u7684\u4e3b\u673a\u540d\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801\u548c\u6570\u636e\u5e93\u540d\u7b49\u4fe1\u606f\u3002\u53ef\u4ee5\u4f7f\u7528 PHP \u4e2d\u7684 mysqli_connect()<\/code> \u51fd\u6570\u6765\u8fdb\u884c\u914d\u7f6e\u3002\u4f8b\u5982\uff1aperlCopy code$host = \"localhost\"; $user = \"username\"; $password = \"password\"; $database = \"dbname\"; $conn = mysqli_connect($host, $user, $password, $database); if (!$conn) { die(\"Connection failed: \" . mysqli_connect_error()); }<\/code><\/li>\n\n\n\n\u6267\u884c SQL \u67e5\u8be2\uff1a\u4e00\u65e6\u5efa\u7acb\u4e86\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u5c31\u53ef\u4ee5\u6267\u884c SQL \u67e5\u8be2\u4e86\u3002\u53ef\u4ee5\u4f7f\u7528 PHP \u4e2d\u7684 mysqli_query()<\/code> \u51fd\u6570\u6765\u6267\u884c\u67e5\u8be2\u3002\u4f8b\u5982\uff1abashCopy code$sql = \"SELECT * FROM users\"; $result = mysqli_query($conn, $sql); if (mysqli_num_rows($result) > 0) { while ($row = mysqli_fetch_assoc($result)) { echo \"ID: \" . $row[\"id\"] . \" Name: \" . $row[\"name\"]; } } else { echo \"No results found.\"; }<\/code><\/li>\n\n\n\n\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\uff1a\u5728\u5b8c\u6210\u6570\u636e\u5e93\u64cd\u4f5c\u540e\uff0c\u9700\u8981\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u3002\u53ef\u4ee5\u4f7f\u7528 PHP \u4e2d\u7684 mysqli_close()<\/code> \u51fd\u6570\u6765\u5173\u95ed\u8fde\u63a5\u3002\u4f8b\u5982\uff1ascssCopy codemysqli_close($conn);<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u4e0e MySQL \u6570\u636e\u5e93\u8fdb\u884c\u8fde\u63a5\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u53ef\u4ee5\u4f7f\u7528 PHP \u63d0\u4f9b\u7684 MySQL \u6269\u5c55\u6765\u5b8c\u6210\u8fde\u63a5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fde\u63a5\u6570\u636e\u5e93\u65f6\u9700\u8981\u914d\u7f6e\u6b63\u786e\u7684\u4e3b\u673a\u540d\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801\u548c\u6570\u636e\u5e93\u540d\u7b49\u4fe1\u606f\uff0c\u540c\u65f6\u9700\u8981\u5408\u7406\u5730\u5904\u7406\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5f02\u5e38\u60c5\u51b5\uff0c\u4ee5\u786e\u4fdd\u7a0b\u5e8f\u7684\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n\n\n\u8bf7\u8be6\u7ec6\u89e3\u91caPHP\u548cMySQL\u6570\u636e\u5e93\u7684\u67e5\u8be2\u548c\u6570\u636e\u66f4\u65b0<\/p>\n\n\n\n
\u5728 PHP \u4e2d\uff0c\u4e0e MySQL \u6570\u636e\u5e93\u8fdb\u884c\u67e5\u8be2\u548c\u6570\u636e\u66f4\u65b0\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u901a\u5e38\u9700\u8981\u4f7f\u7528 PHP \u63d0\u4f9b\u7684 MySQL \u6269\u5c55\u6765\u5b8c\u6210\u8fd9\u4e9b\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f PHP \u548c MySQL \u6570\u636e\u5e93\u7684\u67e5\u8be2\u548c\u6570\u636e\u66f4\u65b0\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n\n\n\n
\n\u6267\u884c\u67e5\u8be2\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 mysqli_query()<\/code> \u51fd\u6570\u6765\u6267\u884c\u67e5\u8be2\u64cd\u4f5c\u3002\u4f8b\u5982\uff1abashCopy code$sql = \"SELECT * FROM users WHERE id = 1\"; $result = mysqli_query($conn, $sql); if (mysqli_num_rows($result) > 0) { while ($row = mysqli_fetch_assoc($result)) { echo \"ID: \" . $row[\"id\"] . \" Name: \" . $row[\"name\"]; } } else { echo \"No results found.\"; }<\/code><\/li>\n\n\n\n\u66f4\u65b0\u6570\u636e\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 mysqli_query()<\/code> \u51fd\u6570\u6765\u6267\u884c\u66f4\u65b0\u6570\u636e\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\uff1abashCopy code$sql = \"UPDATE users SET name='John' WHERE id=1\"; if (mysqli_query($conn, $sql)) { echo \"Record updated successfully.\"; } else { echo \"Error updating record: \" . mysqli_error($conn); }<\/code><\/li>\n\n\n\n\u63d2\u5165\u6570\u636e\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 mysqli_query()<\/code> \u51fd\u6570\u6765\u6267\u884c\u63d2\u5165\u6570\u636e\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\uff1abashCopy code$sql = \"INSERT INTO users (name, email, password) VALUES ('John', 'john@example.com', '123456')\"; if (mysqli_query($conn, $sql)) { echo \"New record created successfully.\"; } else { echo \"Error: \" . $sql . \"<br>\" . mysqli_error($conn); }<\/code><\/li>\n\n\n\n\u5220\u9664\u6570\u636e\uff1a\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 mysqli_query()<\/code> \u51fd\u6570\u6765\u6267\u884c\u5220\u9664\u6570\u636e\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\uff1abashCopy code$sql = \"DELETE FROM users WHERE id=1\"; if (mysqli_query($conn, $sql)) { echo \"Record deleted successfully.\"; } else { echo \"Error deleting record: \" . mysqli_error($conn); }<\/code><\/li>\n<\/ol>\n\n\n\n\u603b\u4e4b\uff0c\u5728 PHP \u4e2d\uff0c\u4e0e MySQL \u6570\u636e\u5e93\u8fdb\u884c\u67e5\u8be2\u548c\u6570\u636e\u66f4\u65b0\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\uff0c\u53ef\u4ee5\u4f7f\u7528 PHP \u63d0\u4f9b\u7684 MySQL \u6269\u5c55\u6765\u5b8c\u6210\u8fd9\u4e9b\u64cd\u4f5c\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6267\u884c SQL \u8bed\u53e5\u65f6\u9700\u8981\u8fdb\u884c\u9519\u8bef\u5904\u7406\uff0c\u4ee5\u786e\u4fdd\u7a0b\u5e8f\u7684\u6b63\u5e38\u8fd0\u884c\u3002\u53e6\u5916\uff0c\u4e3a\u4e86\u9632\u6b62 SQL \u6ce8\u5165\u653b\u51fb\uff0c\u9700\u8981\u5bf9 SQL \u8bed\u53e5\u4e2d\u7684\u53d8\u91cf\u8fdb\u884c\u5b89\u5168\u5904\u7406\uff0c\u4f8b\u5982\u4f7f\u7528 mysqli_real_escape_string()<\/code> \u51fd\u6570\u8fdb\u884c\u8f6c\u4e49\u3002<\/p>\n\n\n\n\n\n
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