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run code in 200+ php & hhvm versions
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<?php $a=[]; var_dump(explode(',', $a));
based on dXgAr
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Warning: explode() expects parameter 2 to be string, array given in /in/eK4dH on line 5 NULL