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@ 2014-07-29T12:03:56Z

<?php
class A {
    function b (&$x = null) {
		$x = 1;
        return true;
    }
}
$a = new A();
$a->b();

$x = null;
$a->b($x);
var_dump($x);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

39.32 ms | 402 KiB | 5 Q