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@ 2014-04-15T14:24:35Z

<?php

class A
{
    public $b;
}

class B
{
    public $a;
}

$a = new A;
$a->b = new B;
$a->b->a = $a;

echo json_encode($a);

Output
Performance
VLD
References
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json_encode: documentation ( source)

preferences:dark modelive preview

45.36 ms | 402 KiB | 5 Q