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run code in 150+ php & hhvm versions
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<?php $arr1=array(true); $arr2=array("true"); var_dump(array_diff($arr1, $arr2));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> bool(true) }