PHP之構造析構

在實例化一個新物件時，建構方法和析構方法都會自動調用，若有繼承則會使用父類別的對應方法。

• 析構方法在三種情況下會被呼叫：

  • 使用unset（）銷毀一個對象，若存在對象傳值則不會被呼叫；
  • 改變變數指向對象的值；

🎜🎜 php程式碼運行結束後。 🎜🎜🎜🎜

<code><span><span><?php </span><span><span>class</span><span>base</span>{</span><span>public</span><span>$name</span>;

    <span><span>function</span><span>__construct</span><span>(<span>$name</span>)</span>{</span><span>$this</span>->name = <span>$name</span>;
        <span>echo</span><span>'obj '</span>.<span>$this</span>->name.<span>' have built'</span>.<span>''</span>.<span>''</span>;
    }
    <span><span>function</span><span>__destruct</span><span>()</span>{</span><span>echo</span><span>'obj '</span>.<span>$this</span>->name.<span>' have destroyed'</span>.<span>''</span>.<span>''</span>;
    }
}

<span>$a</span> = <span>new</span> base(<span>'a'</span>);
<span>$b</span> = <span>new</span> base(<span>'b'</span>);
<span>$c</span> = <span>new</span> base(<span>'c'</span>);

<span>unset</span>(<span>$b</span>);
<span>$c</span> = <span>'d'</span>;</span></span></code>

🎜🎜🎜🎜').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i 🎜').text(i)); }; $numbering.fadeIn(1700); }); }); 🎜 🎜 以上就介紹了PHP之構造析構，包括了方面的內容，希望對PHP教程有興趣的朋友有幫助。 🎜 🎜 🎜