PHP閲嶈浇
PHP鎵鎻愪緵鐨"閲嶈浇"锛坥verloading锛夋槸鎸囧姩鎬佸湴"鍒涘缓"绫诲睘鎬у拰鏂规硶銆傛垜浠槸閫氳繃 榄旀湳鏂规硶锛坢agic methods锛夋潵瀹炵幇鐨勩
褰撹皟鐢ㄥ綋鍓嶇幆澧冧笅鏈畾涔夋垨涓嶅彲瑙佺殑绫诲睘鎬ф垨鏂规硶鏃讹紝閲嶈浇鏂规硶浼氳璋冪敤銆傛湰鑺傚悗闈㈠皢浣跨敤 "涓嶅彲璁块棶鎴愬憳锛坕naccessible members锛"鍜"涓嶅彲璁块棶鏂规硶锛坕naccessible methods锛"鏉ョО鍛艰繖浜涙湭瀹氫箟鎴栦笉鍙鐨勭被灞炴ф垨鏂规硶銆
鎵鏈夌殑閲嶈浇鏂规硶閮藉繀椤昏澹版槑涓簆ublic銆
Note:
杩欎簺榄旀湳鏂规硶鐨勫弬鏁伴兘涓嶈兘 閫氳繃寮曠敤浼犻掋
Note:
PHP涓殑"閲嶈浇"涓庡叾瀹冪粷澶у鏁伴潰鍚戝璞¤瑷涓嶅悓銆備紶缁熺殑"閲嶈浇"鏄敤浜庢彁渚涘涓悓鍚嶇殑 绫绘柟娉曪紝浣嗗悇鏂规硶鐨勫弬鏁扮被鍨嬪拰涓暟涓嶅悓銆
鏇存柊鏃ュ織
鐗堟湰 璇存槑
5.1.0 鏂板 __isset() 鍜 __unset()涓や釜榄旀湳鏂规硶.
5.3.0 鏂板 __callStatic()榄旀湳鏂规硶. 鍙鎬ф湭璁剧疆涓簆ublic鎴栨湭澹版槑涓簊tatic鐨勬椂鍊欎細浜х敓涓涓鍛
灞炴ч噸杞
void __set ( string $name , mixed $value ) mixed __get ( string $name ) bool __isset ( string $name ) void __unset ( string $name )
鍦ㄧ粰鏈畾涔夌殑鍙橀噺璧嬪兼椂锛宊_set() 浼氳璋冪敤銆
璇诲彇鏈畾涔夌殑鍙橀噺鐨勫兼椂锛宊_get() 浼氳璋冪敤銆
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<code><?php
class MemberTest {
/** 琚噸杞界殑鏁版嵁淇濆瓨鍦ㄦ */
private $data = array();
/** 閲嶈浇涓嶈兘琚敤鍦ㄥ凡缁忓畾涔夌殑灞炴 */
public $declared = 1;
/** 鍙湁浠庣被澶栭儴璁块棶杩欎釜灞炴ф椂锛岄噸杞芥墠浼氬彂鐢 */
private $hidden = 2;
public function __set($name, $value) {
echo "Setting '$name' to '$value' ";
$this->data[$name] = $value;
}
public function __get($name) {
echo "Getting '$name' ";
if (array_key_exists($name, $this->data)) {
return $this->data[$name];
}
$trace = debug_backtrace();
trigger_error(
'Undefined property via __get(): ' . $name .
' in ' . $trace[0]['file'] .
' on line ' . $trace[0]['line'],
E_USER_NOTICE);
return null;
}
/** PHP 5.1.0涔嬪悗鐗堟湰 */
public function __isset($name) {
echo "Is '$name' set? ";
return isset($this->data[$name]);
}
/** PHP 5.1.0涔嬪悗鐗堟湰 */
public function __unset($name) {
echo "Unsetting '$name' ";
unset($this->data[$name]);
}
/** 闈為瓟鏈柟娉 */
public function getHidden() {
return $this->hidden;
}
}
echo "<pre> ";
$obj = new MemberTest;
$obj->a = 1;
echo $obj->a . " ";
var_dump(isset($obj->a));
unset($obj->a);
var_dump(isset($obj->a));
echo " ";
echo $obj->declared . " ";
echo "Let's experiment with the private property named 'hidden': ";
echo "Privates are visible inside the class, so __get() not used... ";
echo $obj->getHidden() . " ";
echo "Privates not visible outside of class, so __get() is used... ";
echo $obj->hidden . " ";
?></code>
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浠ヤ笂渚嬬▼浼氳緭鍑猴細
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Setting 'a' to '1'
Getting 'a'
1
Is 'a' set?
bool(true)
Unsetting 'a'
Is 'a' set?
bool(false)
1
Let's experiment with the private property named 'hidden':
Privates are visible inside the class, so __get() not used...
2
Privates not visible outside of class, so __get() is used...
Getting 'hidden'
Notice: Undefined property via __get(): hidden in <file> on line 70 in <file> on line 29
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鏂规硶閲嶈浇
mixed __call ( string $name , array $arguments ) mixed __callStatic ( string $name , array $arguments )褰撹皟鐢ㄤ竴涓笉鍙闂柟娉曪紙濡傛湭瀹氫箟锛屾垨鑰呬笉鍙锛夋椂锛宊_call() 浼氳璋冪敤銆
褰撳湪闈欐佹柟娉曚腑璋冪敤涓涓笉鍙闂柟娉曪紙濡傛湭瀹氫箟锛屾垨鑰呬笉鍙锛夋椂锛宊_callStatic() 浼氳璋冪敤銆
$name鍙傛暟鏄璋冪敤鐨勬柟娉曞悕绉般$arguments鍙傛暟鏄竴涓暟缁勶紝鍖呭惈鐫瑕佷紶閫掔粰鏂规硶鐨勫弬鏁般
Example #2 浣跨敤 __call 鍜 ___callStatic 璋冪敤瀵硅薄涓殑鏂规硶
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<code><?php
class MethodTest {
public function __call($name, $arguments) {
// 娉ㄦ剰: $name 鍖哄垎澶у皬鍐
echo "Calling object method '$name' "
. implode(', ', $arguments). " ";
}
/** PHP 5.3.0涔嬪悗鐗堟湰 */
public static function __callStatic($name, $arguments) {
// Note: value of $name is case sensitive.
echo "Calling static method '$name' "
. implode(', ', $arguments). " ";
}
}
$obj = new MethodTest;
$obj->runTest('in object context');
MethodTest::runTest('in static context'); // PHP 5.3.0涔嬪悗鐗堟湰
?></code>
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浠ヤ笂渚嬬▼浼氳緭鍑猴細
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Calling object method 'runTest' in object context
Calling static method 'runTest' in static context
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褰撳鏈畾涔夌殑鍙橀噺璋冪敤isset() 鎴 empty()鏃讹紝__isset() 浼氳璋冪敤銆
褰撳鏈畾涔夌殑鍙橀噺璋冪敤unset()鏃讹紝__unset() 浼氳璋冪敤銆
鍙傛暟$name鏄寚瑕佹搷浣滅殑鍙橀噺鍚嶇О銆俖_set() 鏂规硶鐨$value 鍙傛暟鎸囧畾浜$name鍙橀噺鐨勫笺
灞炴ч噸杞藉彧鑳藉湪瀵硅薄涓繘琛屻傚湪闈欐佹柟娉曚腑锛岃繖浜涢瓟鏈柟娉曞皢涓嶄細琚皟鐢ㄣ傛墍浠ヨ繖浜涙柟娉曢兘涓嶈兘琚 澹版槑涓簊tatic銆
Example #1 浣跨敤__get, __set, __isset 鍜 __unset 杩涜閲嶈浇
浠ヤ笂灏辨槸PHP閲嶈浇鐨勮缁嗗唴瀹癸紝鏇村淇℃伅璇峰叧娉∣D浜戝叾瀹冪浉鍏虫枃绔狅紒
鍠 娆 66