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@ 2018-01-11T16:06:24Z

<?php

$x = null;

var_dump(array_key_exists('x', $GLOBALS));
var_dump(array_key_exists('y', $GLOBALS));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

100.94 ms | 1976 KiB | 5 Q