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<?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);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '180.5', 1 => '18', 2 => '4', 3 => '180.91666666666667', 4 => '180.25', ) array ( 0 => '4"', 1 => '18"', 2 => '18 1/4"', 3 => '18 1/2"', 4 => '18 11/12"', )

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