<?php $array = [ '18 1/2"', '18"', '4"', '18 11/12"', '18 1/4"' ]; $asDecimal = preg_replace_callback( '/(\d+)(?: (\d+)\/(\d+))?"/', function ($m) { return $m[1] . (isset($m[3]) ? $m[2] / $m[3] : ''); }, $array ); var_export($asDecimal); echo "\n"; array_multisort($asDecimal, SORT_NUMERIC, $array); var_export($array);
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