Short snippet to evaluate execution time from a function in php

getExecutionTime.php

<?

/**
 * Gets execution time of a closure (Anonymous Function)
 * 
 * @param $action Closure to execute
 * @param $return [optional] Pass reference to recieve return values
 *
 * @return execution time of the closure in seconds in float
 */ 
function getExecutionTime(Closure $action, &$return=null){
  $mtime = microtime(true);
  $return = $action();
  return microtime(true) - $mtime;
}

/***~~~... EXAMPLE ...~~~***/
$test = function (){
  // test code here
};

echo "Code executed in " . getExecutionTime($test) . " ms!";