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run code in 150+ php & hhvm versions
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<?php $array = array('vk_group' => NULL,'vk_group1' => NULL,'vk_group2' => NULL); var_dump(in_array($array));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Warning: in_array() expects at least 2 parameters, 1 given in /in/D2M2r on line 4 NULL
Output for 4.3.0 - 5.2.17
Warning: Wrong parameter count for in_array() in /in/D2M2r on line 4 NULL