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run code in 300+ PHP versions simultaneously
<?php $a = array('foo' => true, 'bar' => false); array_filter($a, function ($b) { print_r($a); print_r($b); });
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a in /in/srmI9 on line 6 1 Warning: Undefined variable $a in /in/srmI9 on line 6

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