在PHP中跟踪脚本执行时间

Question

PHP必须跟踪特定脚本用于强制执行max_execution_time限制的CPU时间量.

有没有办法在脚本内部访问这个？我想在我的测试中包含一些日志,记录实际PHP中有多少CPU被烧毁(当脚本处于等待数据库时,时间不会增加).

我正在使用Linux机器.

Answer 1

如果您只需要挂钟时间而不是CPU执行时间,那么计算起来很简单:

//place this before any script you want to calculate time
$time_start = microtime(true); 

//sample script
for($i=0; $i<1000; $i++){
 //do anything
}

$time_end = microtime(true);

//dividing with 60 will give the execution time in minutes otherwise seconds
$execution_time = ($time_end - $time_start)/60;

//execution time of the script
echo '<b>Total Execution Time:</b> '.$execution_time.' Mins';
// if you get weird results, use number_format((float) $execution_time, 10) 

请注意,这将包括PHP等待外部资源(如磁盘或数据库)的时间,这些资源不用于max_execution_time.

Answer 2

在unixoid系统上(以及在Windows上的php 7+中),您可以使用getrusage,例如:

// Script start
$rustart = getrusage();

// Code ...

// Script end
function rutime($ru, $rus, $index) {
    return ($ru["ru_$index.tv_sec"]*1000 + intval($ru["ru_$index.tv_usec"]/1000))
     -  ($rus["ru_$index.tv_sec"]*1000 + intval($rus["ru_$index.tv_usec"]/1000));
}

$ru = getrusage();
echo "This process used " . rutime($ru, $rustart, "utime") .
    " ms for its computations\n";
echo "It spent " . rutime($ru, $rustart, "stime") .
    " ms in system calls\n";

请注意,如果要为每个测试生成一个php实例,则无需计算差异.

Answer 3

更短版本的talal7860的答案

<?php
// At start of script
$time_start = microtime(true); 

// Anywhere else in the script
echo 'Total execution time in seconds: ' . (microtime(true) - $time_start);

正如所指出的,这是'挂钟时间'而不是'cpu时间'

Answer 4

最简单的方法:

<?php

$time1 = microtime(true);

//script code
//...

$time2 = microtime(true);
echo 'script execution time: ' . ($time2 - $time1); //value in seconds

Answer 5

<?php
// Randomize sleeping time
usleep(mt_rand(100, 10000));

// As of PHP 5.4.0, REQUEST_TIME_FLOAT is available in the $_SERVER superglobal array.
// It contains the timestamp of the start of the request with microsecond precision.
$time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];

echo "Did nothing in $time seconds\n";
?>

Answer 6

我创建了一个可以在开箱即用的phihag答案中使用的ExecutionTime类:

class ExecutionTime
{
     private $startTime;
     private $endTime;

     public function start(){
         $this->startTime = getrusage();
     }

     public function end(){
         $this->endTime = getrusage();
     }

     private function runTime($ru, $rus, $index) {
         return ($ru["ru_$index.tv_sec"]*1000 + intval($ru["ru_$index.tv_usec"]/1000))
     -  ($rus["ru_$index.tv_sec"]*1000 + intval($rus["ru_$index.tv_usec"]/1000));
     }    

     public function __toString(){
         return "This process used " . $this->runTime($this->endTime, $this->startTime, "utime") .
        " ms for its computations\nIt spent " . $this->runTime($this->endTime, $this->startTime, "stime") .
        " ms in system calls\n";
     }
 }

用法:

$executionTime = new ExecutionTime();
$executionTime->start();
// code
$executionTime->end();
echo $executionTime;

注意:在PHP 5中,getrusage函数仅适用于Unix-oid系统.从PHP 7开始,它也适用于Windows.

Answer 7

developerfusion.com上的Gringod给出了这个很好的答案:

<!-- put this at the top of the page --> 
<?php 
   $mtime = microtime(); 
   $mtime = explode(" ",$mtime); 
   $mtime = $mtime[1] + $mtime[0]; 
   $starttime = $mtime; 
;?> 

<!-- put other code and html in here -->


<!-- put this code at the bottom of the page -->
<?php 
   $mtime = microtime(); 
   $mtime = explode(" ",$mtime); 
   $mtime = $mtime[1] + $mtime[0]; 
   $endtime = $mtime; 
   $totaltime = ($endtime - $starttime); 
   echo "This page was created in ".$totaltime." seconds"; 
;?>

来自(http://www.developerfusion.com/code/2058/determine-execution-time-in-php/)

Answer 8

要显示分钟和秒，您可以使用：

    $startTime = microtime(true);
    $endTime = microtime(true);
    $diff = round($endTime - $startTime);
    $minutes = floor($diff / 60); //only minutes
    $seconds = $diff % 60;//remaining seconds, using modulo operator
    echo "script execution time: minutes:$minutes, seconds:$seconds"; //value in seconds

Answer 9

最便宜和最脏的方法就是microtime()在您想要进行基准测试的代码中的地方拨打电话.在数据库查询之前和之后立即执行,并且很容易从脚本执行的其余时间中删除这些持续时间.

提示:您的PHP执行时间很少会使您的脚本超时.如果脚本超时,它几乎总是调用外部资源.

PHP microtime文档:http: //us.php.net/microtime

Answer 10

我想你应该看看xdebug.分析选项将使您了解许多与过程相关的项目.

http://www.xdebug.org/

Answer 11

如果您将秒输出格式化为更漂亮,那将会更漂亮:

echo "Process took ". number_format(microtime(true) - $start, 2). " seconds.";

将打印

Process took 6.45 seconds.

这要好得多

Process took 6.4518549156189 seconds.

Answer 12

当 PHP 中有闭包功能时，我们为什么不从中受益呢？

function startTime(){
    $startTime = microtime(true);
    return function () use ($startTime){
        return microtime(true) - $startTime;
    };
}

现在借助上述函数，我们可以像这样跟踪时间

$stopTime = startTime();
//some code block or line
$elapsedTime = $stopTime();

每次调用startTime函数都会启动一个单独的时间跟踪器。因此，您可以根据需要发起任意数量的操作，也可以在任意位置停止它们。

Answer 13

$_SERVER['REQUEST_TIME']

也检查一下。IE

...
// your codes running
...
echo (time() - $_SERVER['REQUEST_TIME']);