PHP 생성자와 소멸자 사용법에 대한 자세한 설명

<?php
class base{
  public $name;
  function construct($name){
    $this->name = $name;
    echo &#39;obj &#39;.$this->name.&#39; have built&#39;.&#39;</br>&#39;.&#39;</br>&#39;;
  }
  function destruct(){
    echo &#39;obj &#39;.$this->name.&#39; have destroyed&#39;.&#39;</br>&#39;.&#39;</br>&#39;;
  }
}
$a = new base(&#39;a&#39;);
$b = new base(&#39;b&#39;);
$c = new base(&#39;c&#39;);
unset($b);
$c = &#39;d&#39;;

obj a have built
obj b have built
obj c have built
obj b have destroyed
obj c have destroyed
obj a have destroyed