<?php $array = [ "GL001_M", "GL001_XS", "GL001_S", "GL001_L", "GL002_M", "GL002_XS", "GL002_S", "GL002_L" ]; foreach ($array as $v) { [$ids[], $sizes[]] = explode('_', $v, 2); } array_multisort( $ids, $sizes, SORT_DESC, $array ); var_export($array);
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