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run code in 200+ php & hhvm versions
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<?php $options = 'fr=1&mm=1'; $arr = explode('&',$options); var_dump($arr); sort($arr); var_dump($arr);
based on e2oL3
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(4) "fr=1" [1]=> string(4) "mm=1" } array(2) { [0]=> string(4) "fr=1" [1]=> string(4) "mm=1" }