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run code in 300+ PHP versions simultaneously
e<?php $a = 'foo'; $temporaryA = $a; $a = md5('value for finding ' . uniqid()); $variables = get_defined_vars(); $key = array_search($a, $variables, true); var_dump($key); $a = $temporaryA; unset ($temporaryA);

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33.31 ms | 402 KiB | 5 Q