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run code in 150+ php & hhvm versions
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<?php var_dump(array_diff(array(array(1), array(2)), array()));
based on ODBlX
Output for 4.3.0 - 5.3.29, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> array(1) { [0]=> int(1) } [1]=> array(1) { [0]=> int(2) } }
Output for 5.4.0 - 5.6.28
Notice: Array to string conversion in /in/i8mND on line 3 Notice: Array to string conversion in /in/i8mND on line 3 Notice: Array to string conversion in /in/i8mND on line 3 Notice: Array to string conversion in /in/i8mND on line 3 array(2) { [0]=> array(1) { [0]=> int(1) } [1]=> array(1) { [0]=> int(2) } }