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@ 2014-10-23T04:17:20Z

<?php
$x = '';
$$x = 'empty';
var_dump( ${''} );

$x = 'red';
$$x = 'empty';
var_dump( $red );

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

77.33 ms | 402 KiB | 5 Q