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<?php var_dump($vals = explode(' ', null)); var_dump(($vals && strlen(current($vals)) > 0) ? $vals : array());
Output for 4.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(0) "" } array(0) { }
Output for hhvm-3.12.0
Warning: explode() expects parameter 2 to be string, null given in /in/glHq1 on line 2 NULL array(0) { }