Handy little snippet to get benchmark time for a function

benchmark.php

<?php

/**
 * Calculates the time needed to run the specified function.
 * @param     $function                 string The callback to run.
 * @param     $function_args            array Array of arguments to pass.
 * @param int $number_of_times          int The number of times this function should run.
 * @return array containing the following information for each benchmark:
 *                                      $benchmark_time float The amount of time this benchmark took to run
 *                                      $total_time float The total amount of time it has taken to run this function
 *                                      so-far
 *                                      $result mixed The returned result of the called function
 */
function get_time_to_run_function( $function, $function_args, $number_of_times = 1 ) {
	$benchmarks = array();
	$start      = microtime( true );
	$i          = 0;
	while( $i < $number_of_times ){
		$current      = microtime( true );
		$result       = call_user_func_array( $function, $function_args );
		$time         = microtime( true );
		$benchmarks[] = array( 'benchmark_time' => $time - $current, 'total_time' => $time - $start, 'result' => $result );
		$i ++;
	}

	return $benchmarks;
}