PHP structure and destruction

When instantiating a new object, the constructor and destructor methods will be automatically called. If there is inheritance, the corresponding method of the parent class will be used.

• The destructor method will be called in three situations:

  • Use unset() to destroy an object. If there is an object passed by value, it will not be called;
  • Change the value of the variable pointing to the object;
  • After the php program code has finished running.

<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>

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The above has introduced the structure and destruction of PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.