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run code in 200+ php & hhvm versions
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<?php $b= array(1,2,3,4,5,6,7); $a = array(2,3,4); var_dump( (count($a)-count($b))?$a:$b );
Output for 4.3.0 - 7.1.10
array(3) { [0]=> int(2) [1]=> int(3) [2]=> int(4) }