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run code in 150+ php & hhvm versions
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<?php $options = 'fr=1&mm=1&a=2'; $arr = explode('&',$options); var_dump($arr); sort($arr); var_dump($arr);
based on WF34r
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(4) "fr=1" [1]=> string(4) "mm=1" [2]=> string(3) "a=2" } array(3) { [0]=> string(3) "a=2" [1]=> string(4) "fr=1" [2]=> string(4) "mm=1" }