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run code in 150+ php & hhvm versions
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<?php $a = 'a,b,c'; $b = ''; var_dump(explode(',',$a)); var_dump(explode(',',$b));
based on HQHud
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } array(1) { [0]=> string(0) "" }