PHP 滿載
Jun 13, 2016 pm 12:08 PM
PHP 重載
PHP 重載一個(gè)類中的方法與另一個(gè)方法同名,但是參數(shù)不同,這種方法稱之為重載方法。很遺憾因?yàn)?PHP 是弱類型的語(yǔ)言, 所以在方法的參數(shù)中本身就可以接收不同類型的數(shù)據(jù),又因?yàn)?PHP 的方法可以接收不定個(gè)數(shù)的參數(shù),所以在 PHP 里面沒(méi)有嚴(yán)格意義上的方法重載。PHP 中的重載是指在子類里面定義了一個(gè)和父類同名的方法,且該方法將在子類中將把父類的方法覆蓋。在子類中,因?yàn)閺母割惱^承過(guò)來(lái)的方法可能無(wú)法訪問(wèn)子類定義的屬性或方法,所以有時(shí)候重載是必要的。例子:<?phpclass Person { var $name; var $age; function say() { echo "我的名字叫:".$this->name."<br>"; echo "我的年齡是:".$this->age; }}// 類的繼承class Student extends Person { var $school; //學(xué)生所在學(xué)校的屬性 function say() { echo "我的名字叫:".$this->name."<br>"; echo "我的年齡是:".$this->age."<br>"; echo "我正在".$this->school."學(xué)習(xí)"; } }$t1 = new Student();$t1->name = "張三";$t1->age = "18";$t1->school = "人民大學(xué)";$t1->say();?>運(yùn)行該例子,輸出:我的名子叫:張三我的年齡是:18我正在人民大學(xué)學(xué)習(xí)提示如果父類定義方法時(shí)使用了 final 關(guān)鍵字,則不允許被子類方法覆蓋。訪問(wèn)父類被覆蓋的方法可以通過(guò) :: 符號(hào)來(lái)訪問(wèn)父類被覆蓋的方法或成員屬性:function say() { parent::say(); //或者 Person::say(); echo "我在".$this->school."上學(xué)<br>";

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