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run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array(array(1,2)); var_dump(call_user_func_array('array_merge', array()));
Output for 5.3.0 - 7.1.0
Warning: array_merge() expects at least 1 parameter, 0 given in /in/6uK1U on line 4 NULL
Output for 4.3.0 - 5.2.17
Warning: Wrong parameter count for array_merge() in /in/6uK1U on line 4 NULL