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php-timeit估計php函數的執行時間

WBOY
WBOY原創
2016-07-29 09:16:13906瀏覽

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  谷歌guge不行了,就打119谷歌學術:scholar.

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.com  有時候我們在PHP性能優化的時候,需要知道某個函數的執行時間,在Python中,有timeit模組,在PHP中不知道有沒有類似的模組?

  於是,我自己寫了一個簡單的timeit函數,如下:

/**
 * Compute the delay to execute a function a number of time
 * @param $count    Number of time that the tests will execute the given function
 * @param $function        the function to test. Can be a string with parameters (ex: 'myfunc(123, 0, 342)') or a callback
 * @return float            Duration in seconds (as a float)
 */
function timeit($count, $function<span>) {
    if ($count <= 0<span>){
        echo "Error: count have to be more than zero"<span>;
        return -1<span>;
    }
    
    $nbargs = func_num_args<span>();
    if ($nbargs < 2<span>) {
        echo 'Error: No Funciton!'<span>;
        echo 'Usage:'<span>;
        echo "\ttimeit(count, 'function(param)')"<span>;
        echo "\te.g:timeit(100, 'function(0,2)')"<span>;
        return -1;                        // no function to time
<span>    }
    
    // Generate callback
    $func = func_get_arg(1<span>);
    $func_name = current(explode('(', $func<span>));
    if (!function_exists($func_name<span>)) {
        echo 'Error: Unknown Function'<span>;
        return -1;                    // can't test unknown function
<span>    }
    
    $str_cmd = ''<span>;
    $str_cmd .= '$start = microtime(true);'<span>;
    $str_cmd .= 'for($i=0; $i<'.$count.'; $i++) '.$func.';'<span>;
    $str_cmd .= '$end = microtime(true);'<span>;
    $str_cmd .= 'return ($end - $start);'<span>;
    
    return eval($str_cmd<span>);
}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

  測試一下自己寫的一個求根演算法與系統內建:

//取平方根
function sqrt_nd($num<span>){
    $value = $num<span>;
    while(abs($value*$value -$num) > 0.001<span>){
        $value = ($value + $num/$value)/2<span>;
    }
    return $value<span>;
}


print timeit(1000, 'sqrt_nd(5)'<span>);
print "\n"<span>;
print timeit(1000, 'sqrt(5)');</span></span></span></span></span></span>

  可見,內建求根函數比自訂的求根函數快了6倍多~~

以上就介紹了php-timeit估計php函數的執行時間,包含了面向的內容,希望對PHP教學有興趣的朋友有幫助。

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