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run code in 300+ PHP versions simultaneously
<?php $array = [ 'str' => 'foo', 'empty' => '', 'zero' => 0, 'one' => 1, 'null' => null, 'false' => false, 'true' => true, ]; var_export(array_keys($array, null));
Output for git.master_jit, git.master, rfc.property-hooks
array ( 0 => 'empty', 1 => 'zero', 2 => 'null', 3 => 'false', )

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