Calculate what the function execute spend.

cal_run_time.php

<?php


/**
 * 计算函数的执行时间，可以用于性能统计
 * @param $function
 * @param array $params
 * @param int $times
 * @return mixed
 */
function cal_run_time($function, $params = array(), $times = 100) {
    $_start = microtime(true);

    for($i = 0; $i < $times; $i ++) {
        call_user_func_array($function, $params);
    }

    $_end = microtime(true);

    return $_end - $_start;
}