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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(array_keys(array('car'=>1, 'bike'=>2), "1", true));
Output for 5.0.0 - 7.2.6
array(0) { }
Output for 4.3.0 - 4.4.9
Warning: Wrong parameter count for array_keys() in /in/g1Itr on line 3 NULL