PHP内存泄露与垃圾回收

[php]代码库

class A{
    private $b;
    function __construct(){
        $this->b = new B($this);
    }
    function __destruct(){
        //echo "A destruct\n";
    }
}

class B{
    private $a;
    function __construct($a){
        $this->a = $a;
    }
    function __destruct(){
        //echo "B descturct\n";
    }
}

for($i=0;;$i++){
    $a = new A();
    if($i00 == 0){
        echo memory_get_usage()."\n";
    }
}