{"id":93,"date":"2012-11-15T00:26:47","date_gmt":"2012-11-14T16:26:47","guid":{"rendered":"http:\/\/www.yeetrack.com\/post\/2012-11-14\/php%25E9%25AD%2594%25E6%259C%25AF%25E6%2596%25B9%25E6%25B3%2595%25E8%25A7%25A3%25E6%259E%2590"},"modified":"2013-04-20T17:27:15","modified_gmt":"2013-04-20T09:27:15","slug":"php%e9%ad%94%e6%9c%af%e6%96%b9%e6%b3%95%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.yeetrack.com\/?p=93","title":{"rendered":"php\u9b54\u672f\u65b9\u6cd5\u89e3\u6790"},"content":{"rendered":"

PHP\u628a\u6240\u6709\u4ee5__\uff08\u4e24\u4e2a\u4e0b\u5212\u7ebf\uff09\u5f00\u5934\u7684\u7c7b\u65b9\u6cd5\u5f53\u6210\u9b54\u672f\u65b9\u6cd5\u3002<\/p>\n

<\/p>\n

\u6240\u4ee5\u5f53\u81ea\u5b9a\u4e49\u7c7b\u65b9\u6cd5\u65f6\uff0c\u9664\u4e86\u9b54\u672f\u65b9\u6cd5,\u5efa\u8bae\u4e0d\u8981\u4ee5 __\u4e3a\u524d\u7f00\u3002 php\u9b54\u672f\u65b9\u6cd5\u5305\u62ec\uff1a __construct(), __destruct(), __get(), __set(), __isset(), __unset(), __sleep(), __wakeup(), __toString(), __invoke(), __clone(),__call()\u7b49\u3002<\/p>\n

    \n
  1. \n

    __construct() \u662fphp\u4e2d\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u7528\u6765\u521d\u59cb\u5316\u7c7b\u4e2d\u7684\u5c5e\u6027\u3002\u540c\u4e00\u4e2a\u7c7b\u4e2d\u53ea\u80fd\u58f0\u660e\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u6545\u4e0d\u80fd\u91cd\u8f7d\u3002\u4f46\u53ef\u4ee5\u4f7f\u7528\u9ed8\u8ba4\u53c2\u6570\u3002\u6784\u9020\u65b9\u6cd5\u4e00\u822c\u662fpublic\u7c7b\u578b\u7684\uff0c\u5982\u679c\u662fprivate\u7c7b\u578b\uff0c\u5c31\u4f1a\u6784\u6210\u5355\u4f8b\u6a21\u5f0f\uff0cphp\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f<\/a>\u3002<\/p>\n

    <?php\n    class Person\n    {\n        private $name;\n        private $age;\n        private $email;\n        \/\/\u58f0\u660e\u7c7b\u7684\u6784\u9020\u51fd\u6570\n        public function __construct($name="yeetrack", $age=1, $email="yeetrack@123.com")\n        {\n            $this->name = $name;\n            $this->age = $age;\n            $this ->email = $email;\n        }\n        public function printInfo()\n        {\n            echo "name->" . $this->name . " age->" . $this->age . " email->" . $this->email . "<br\/>";\n        }\n    }\n                                                                                                                                                                                                          \n    $per = new Person("youthflies",2);\n    $per->printInfo();\n?><\/pre>\n
     <\/p>\n<\/li>\n
  2. \n
    __destruct()\u662fphp\u4e2d\u7c7b\u7684\u6790\u6784\u65b9\u6cd5\uff0c\u5bf9\u8c61\u5728\u9500\u6bc1\u524d\u81ea\u52a8\u8c03\u7528\u6b64\u65b9\u6cd5\uff0c\u5e38\u5728\u6790\u6784\u65b9\u6cd5\u4e2d\u6267\u884c\u5173\u95ed\u6587\u4ef6\uff0c\u91ca\u653e\u8fde\u63a5\u7b49\u64cd\u4f5c\u3002php\u81ea\u5e26\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u5f53\u5bf9\u8c61\u4e0d\u80fd\u88ab\u8bbf\u95ee\u65f6\u5c31\u4f1a\u81ea\u52a8\u542f\u7528\u5783\u573e\u56de\u6536\u7684\u673a\u5236\uff0c\u91ca\u653e\u5bf9\u8c61\u5360\u7528\u7684\u5806\u7a7a\u95f4\u3002\u800cphp\u7684\u6790\u6784\u65b9\u6cd5\u662f\u5728\u542f\u52a8\u5783\u573e\u56de\u6536\u4e4b\u524d\u8c03\u7528\u7684\u65b9\u6cd5\u3002\u6790\u6784\u65b9\u6cd5\u65b9\u6cd5\u53ea\u6709\u9700\u8981\u7684\u65f6\u5019\u624d\u9700\u8981\u58f0\u660e\u3002<\/p>\n<\/li>\n
  3. \n
    \u4e3a\u4e86\u5c01\u88c5\u548c\u6570\u636e\u4fdd\u62a4\uff0c\u6211\u4eec\u4e00\u822c\u628a\u7c7b\u7684\u6570\u636e\u5c5e\u6027\u58f0\u660e\u4e3aprivate\uff0c\u5982\u679c\u9700\u8981\u9891\u7e41\u7684\u8bfb\u53d6\u6570\u636e\u5c5e\u6027\uff0c\u5c31\u4f1a\u5f88\u7e41\u7410\u3002__set()\u65b9\u6cd5\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5b83\u80fd\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u4e3aprivate\u7c7b\u578b\u7684\u6570\u636e\u8d4b\u503c\u3002\u627f\u63a5\u4e0a\u9762\u4ee3\u7801\uff1a<\/p>\n
    \/\/\u58f0\u660e\u9b54\u672f\u65b9\u6cd5__set()\n        public function __set($propertyName, $value)\n        {\n            if($propertyName == "name")\n                $this->name = $value; \/\/\u4e3aname\u8d4b\u503c\n            elseif ($propertyName == "age")\n            {   \n                if($value>200 | $value<0) \/\/\u5224\u65adage\u8303\u56f4\n                    return;\n                $this->age = $value;\n            }\n            elseif ($propertyName == "email")\n                $this->email = $value;\n        }<\/pre>\n
    \u6709\u4e86__set\u7684\u58f0\u660e\u6211\u4eec\u5c31\u53ef\u4ee5\u8fd9\u6837\u4e3a\u6210\u5458\u5c5e\u6027\u8d4b\u503c\uff08\u867d\u7136\u5c5e\u6027\u662fprivate\u7c7b\u578b\u7684\uff09<\/p>\n
    $per = new Person("youthflies",2);\n$per->name = "youthflies";\n$per ->age = 12;\n$per->email = "youthflies@123.com";\n$per->printInfo();<\/pre>\n
    \u8fd9\u6837\u8d4b\u503c\uff0cphp\u5c31\u4f1a\u9ed8\u8ba4\u53bb\u8c03\u7528__set()\u65b9\u6cd5\u3002<\/p>\n<\/li>\n
  4. \n
    \u5982\u679c\u4e00\u4e2a\u5c5e\u6027\u88ab\u58f0\u660e\u4e3aprivate\u7c7b\u578b\uff0c\u800c\u5728\u5bf9\u8c61\u5916\u9762\u76f4\u63a5\u83b7\u53d6\u8be5\u5c5e\u6027\uff0cphp\u5c31\u4f1a\u9ed8\u8ba4\u53bb\u5bfb\u627e__get()\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u53ef\u4ee5\u5728\u7a0b\u5e8f\u8fd0\u884c\u4e2d\u83b7\u53d6private\u7c7b\u578b\u7684\u6570\u636e\u3002\u627f\u63a5\u4e0a\u9762\u4ee3\u7801\uff1a<\/p>\n
    \/\/\u58f0\u660e\u9b54\u672f\u65b9\u6cd5__get()\n        public function __get($propertyName)\n        {\n            if($propertyName == "name")\n                return $this->name;\n            elseif ($propertyName == "age") \/\/\u4e0d\u5141\u8bb8\u83b7\u53d6age\u5c5e\u6027\n                return "secret";\n            elseif ($propertyName == "email")\n                return $this->email;\n        }<\/pre>\n
    \u5982\u4e0a\u9762\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u5728__get()\u65b9\u6cd5\u4e2d\u52a0\u5165\u4e00\u4e9b\u6743\u9650\u63a7\u5236\uff0c\u6216\u8005\u8fd4\u56de\u4e00\u4e9b\u5047\u6570\u636e\u7b49\u7b49\u3002<\/p>\n<\/li>\n
  5. \n
    isset()\u65b9\u6cd5\u7528\u6765\u5224\u65ad\u53d8\u91cf\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u7c7b\u4e2d\u7684\u5c5e\u6027\u4e3apublic\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u7528isset()\u65b9\u6cd5\u6765\u5224\u65ad\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\uff0c\u4f46\u5982\u679c\u4e3aprivate\u7c7b\u578b\u7684\uff0c\u5c31\u4e0d\u80fd\u76f4\u63a5\u5224\u65ad\u4e86\uff0c\u9700\u8981\u7528\u5230__isset()\u65b9\u6cd5\u3002\u53ea\u6709\u5728\u7c7b\u5185\u90e8\u58f0\u660e\u4e86__isset()\u65b9\u6cd5\uff0c\u6211\u4eec\u624d\u53ef\u4ee5\u5728\u7c7b\u5916\u90e8\u7528isset()\u6765\u95f4\u63a5\u5224\u65ad\u7c7b\u4e2d\u7684private\u6570\u636e\u3002\u627f\u63a5\u4e0a\u9762\u4ee3\u7801\uff1a<\/p>\n
    \/\/\u58f0\u660e\u9b54\u672f\u65b9\u6cd5__isset()\n        public function __isset($propertyName)\n        {\n            if($propertyName == "name")\n                return isset($this->name);\n            elseif ($propertyName == "age")\/\/\u4e0d\u5141\u8bb8\u5224\u65adage\u5c5e\u6027\n                return false;\n            elseif ($propertyName == "email")\n                return isset($this->email);\n        }<\/pre>\n
    \u7ecf\u8fc7\u4e0a\u9762\u7684\u58f0\u660e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5728\u7c7b\u5916\u8fd9\u6837\uff1a<\/p>\n
    var_dump(isset($per->name));\nvar_dump(isset($per->age));\nvar_dump(isset($per->email));<\/pre>\n
     <\/p>\n<\/li>\n
  6. \n
    unset()\u65b9\u6cd5\u7528\u6765\u5220\u9664\u53d8\u91cf\uff0c\u5982\u679c\u7c7b\u4e2d\u7684\u5c5e\u6027\u662fpublic\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u7528unset()\u5220\u9664\uff0c\u5982\u679c\u4e3aprivate\uff0c\u5c31\u8981\u901a\u8fc7__unset()\u65b9\u6cd5\u4e86\uff0c\u7c7b\u4f3c\u4e8e__isset()\u65b9\u6cd5\u3002<\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__unset()\u65b9\u6cd5\n        public function __unset($propertyName)\n        {\n            if($propertyName == "name")\/\/\u4e0d\u5141\u8bb8\u5220\u9664name\u5c5e\u6027\n                return;\n            elseif($propertyName == "age")\n                unset($this->age);\n            elseif ($propertyName == "email")\n                unset($this->email);\n        }<\/pre>\n
    \u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u5728\u7c7b\u5916\u9762\u76f4\u63a5unset()\u7c7b\u4e2dprivate\u7c7b\u578b\u7684\u5c5e\u6027\u4e86\u3002<\/p>\n<\/li>\n
  7. \n
    __toString()\u7528\u6765\u83b7\u53d6\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8f93\u51fa\uff0c\u5f53\u6211\u4eec\u76f4\u63a5\u6253\u5370\u67d0\u5bf9\u8c61\u5f15\u7528 \u65f6\uff0c\u8be5\u65b9\u6cd5\u88ab\u81ea\u52a8\u8c03\u7528\u3002 \u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__toString()\n        public function __toString()\n        {\n            return "name: " . $this->name . "<br\/>age: " . $this->age . "<br\/>email: " . $this->email . "<br\/>";\n        }<\/pre>\n
    \u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u5728\u5916\u9762\u76f4\u63a5 echo $per; php\u4f1a\u9ed8\u8ba4\u53bb\u8c03\u7528\u7c7b\u4e2d\u7684__toString()\u65b9\u6cd5\u3002<\/p>\n<\/li>\n
  8. \n
    \u5f53\u6211\u4eec\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u5728\u7c7b\u4e2d\u4e0d\u5b58\u5728\u65f6\uff0c\u5c31\u4f1a\u51fa\u73b0error\uff0c\u7a0b\u5e8f\u4f1ashutdown\u3002__call()\u65b9\u6cd5\u7528\u6765\u89e3\u51b3\u8fd9\u79cd\u60c5\u51b5\uff0c\u5f53\u8c03\u7528\u4e86\u7c7b\u4e2d\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\u65f6\uff0c__call()\u65b9\u6cd5\u5c31\u4f1a\u88ab\u8c03\u7528\u3002\u8be5\u65b9\u6cd5\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u4e00\u662f\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\u7684\u540d\u79f0\uff0c\u4e8c\u662f\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\u7684\u53c2\u6570\uff08\u4ee5\u6570\u7ec4\u7684\u5f62\u5f0f\u4fdd\u5b58\uff09\u3002<\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__call()\n        public function __call($methodName, $args)\n        {\n            echo "\u65b9\u6cd5\uff1a" . $methodName . "\u4e0d\u5b58\u5728<br\/>";\n            print_r($args);\n        }<\/pre>\n
     <\/p>\n<\/li>\n
  9. \n
    __autoload()\u65b9\u6cd5\u7528\u4e8e\u81ea\u52a8\u52a0\u8f7d\u9700\u8981\u7684\u7c7b\u6587\u4ef6\u3002  \u6211\u4eec\u4e00\u628a\u4e3a\u6bcf\u4e2a\u7c7b\u90fd\u5355\u72ec\u5efa\u7acb\u4e00\u4e2aphp\u6587\u4ef6\uff0c\u5f53\u9700\u8981\u8fd9\u4e2a\u7c7b\u65f6\uff0c\u5c31\u7528include\u5c06php\u6587\u4ef6\u5305\u542b\u8fdb\u6765\u3002 \u5982\u679c\u7c7b\u6587\u4ef6\u975e\u5e38\u591a\uff0c\u5c31\u5f88\u9ebb\u70e6\u3002__autoload()\u53ef\u4ee5\u81ea\u52a8\u52a0\u8f7d\uff0c\u5f53\u7136\u524d\u63d0\u662f\u6211\u4eec\u7528\u4e00\u5b9a\u89c4\u5219\u547d\u540d\u7c7b\u6587\u4ef6\u3002   <\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__autoload()\n        public function __autoload($className)\n        {\n            include(strtolower($className) . ".class.php";\n        }\n                                                                      \n        $hello = new Hello();<\/pre>\n
        \u5982\u4e0a\u4ee3\u7801\uff0c\u6211\u4eec\u65b0\u5efaHello\u5bf9\u8c61\uff0c\u5982\u679cHello\u7c7b\u4e0d\u5b58\u5728\uff0c\u5c31\u4f1a\u9ed8\u8ba4\u8c03\u7528autoload()\u65b9\u6cd5\uff0c$className\u83b7\u5f97\u53c2\u6570"Hello"\uff0c\u7136\u540e\u5b83\u53bbinclude\u5f53\u524d\u6587\u4ef6\u5939\u4e0b\u7684Hello.class.php\u6587\u4ef6\uff0c\u5982\u679c\u6211\u4eec\u6309\u7167\u8fd9\u79cd\u65b9\u5f0f\u547d\u540d\u6211\u4eec\u7684php\u6587\u4ef6\uff0c\u5c31\u4f1ainclude\u6210\u529f\u3002          <\/p>\n<\/li>\n
  10. \n
    php5\u901a\u8fc7\u5f15\u7528\u6765\u8c03\u7528\u5bf9\u8c61\uff0c\u5982\u679c\u6709\u5efa\u7acb\u4e00\u4e2a\u72ec\u7acb\u526f\u672c\u7684\u9700\u6c42\uff0c\u53ef\u4ee5\u901a\u8fc7clone\u65b9\u6cd5\uff0cclone\u83b7\u5f97\u7684\u65f6\u4e24\u4e2a\u5b8c\u5168\u4e00\u6837\u4e14\u4e92\u76f8\u72ec\u7acb\u7684\u5bf9\u8c61\u3002\u5982\u679c\u60f3\u5728clone\u8fc7\u7a0b\u4e2d\u8fdb\u884c\u4e00\u4e9b\u81ea\u5b9a\u4e49\u7684\u521d\u59cb\u5316\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5728\u7c7b\u4e2d\u58f0\u660e__clone()\u65b9\u6cd5\uff0c\u5728\u8c03\u7528clone()\u65b9\u6cd5\u65f6\uff0cphp\u4f1a\u9ed8\u8ba4\u8c03\u7528__clone()\u65b9\u6cd5\u3002  <\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__clone()\n        public function __clone()\n        {\n            $this->name = "youthflies__clone";\n            $this->age = "12__clone";\n            $this->email = "youthflies@124.com__clone";\n        }<\/pre>\n
    \u58f0\u660e\u540e\uff0c  \u5229\u7528\u4e0b\u9762\u4e24\u884c\u4ee3\u7801\u67e5\u770b\u6548\u679c\u3002  <\/p>\n
        $per2 = clone $per;\n    $per2->printInfo();<\/pre>\n
     <\/p>\n<\/li>\n
  11. \n
    __sleep()\u65b9\u6cd5\u5728\u5c06\u5bf9\u8c61\u4e32\u884c\u5316\u65f6\uff08\u5373\u8c03\u7528serialize()\u51fd\u6570\u65f6)\u4f1a\u88ab\u8c03\u7528\uff0c\u5173\u4e8e\u4e32\u884c\u5316\uff0c\u53c2\u8003php\u5bf9\u8c61\u4e32\u884c\u5316 <\/a>\u3002__sleep()\u65b9\u6cd5\u6ca1\u6709\u53c2\u6570\uff0c\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u7528\u6765\u6307\u5b9a\u8981\u88ab\u4e32\u884c\u5316\u7684\u5c5e\u6027\u3002  <\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__sleep()\n        public function __sleep()\n        {\n            return array("name","email");\n        }<\/pre>\n
    \u8fd9\u6837\u5728\u4e32\u884c\u5316$per\u65f6\uff0c\u5c31\u53ea\u4f1a\u628aname\u548cemail\u4e24\u4e2a\u5c5e\u6027\u4e32\u884c\u5316\u3002<\/p>\n<\/li>\n
  12. \n
    __wakeup()\u65b9\u6cd5\u7528\u6765\u5728\u53cd\u4e32\u884c\u5316\u5bf9\u8c61\u65f6\uff0c\u7ed9\u5c06\u8981\u751f\u6210\u7684\u5bf9\u8c61\u521d\u59cb\u5316\u4e00\u4e9b\u6570\u636e\u3002<\/p>\n
    \/\/\u58f0\u660e\u9b54\u6cd5\u65b9\u6cd5__wakeup()\n        public function __wakeup()\n        {\n            $this->age = 12;\n        }<\/pre>\n
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