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run code in 150+ php & hhvm versions
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<?php $a1 = array(2,array(array())); $a2 = array(2,4); $b = array_diff_assoc($a1, $a2); var_dump($b);
based on iTkaq
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Array to string conversion in /in/NWUUa on line 5 array(1) { [1]=> array(1) { [0]=> array(0) { } } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.3.29
array(1) { [1]=> array(1) { [0]=> array(0) { } } }