您可以用一个函数找到以秒为单位的执行时间。

// ampersand is important thing here
function microSec( & $ms ) {
    if (\floatval( $ms ) == 0) {
        $ms = microtime( true );
    }
    else {
        $originalMs = $ms;
        $ms = 0;
        return microtime( true ) - $originalMs;
    }
}

// you don't have to define $ms variable. just function needs
// it to calculate the difference.
microSec($ms);
sleep(10);
echo microSec($ms) . " seconds"; // 10 seconds

for( $i = 0; $i < 10; $i++) {
    // you can use same variable everytime without assign a value
    microSec($ms);
    sleep(1);
    echo microSec($ms) . " seconds"; // 1 second
}

for( $i = 0; $i < 10; $i++) {
    // also you can use temp or useless variables
    microSec($xyzabc);
    sleep(1);
    echo microSec($xyzabc) . " seconds"; // 1 second
}

我想分享一下我的功能。希望能帮你节省时间。

它最初用于跟踪基于文本的脚本的时间，因此输出是文本形式的。但如果您愿意，可以轻松地将其修改为HTML。

它将为您计算自脚本开始和在每个步骤中花费了多少时间。它将所有输出格式化为3个精度小数。(精确到毫秒。)

一旦将它复制到脚本的顶部，所要做的就是将recordTime函数调用放在想要计时的每个片段之后。

复制到你的脚本文件的顶部:

$tRecordStart = microtime(true);
header("Content-Type: text/plain");
recordTime("Start");

function recordTime ($sName) {
  global $tRecordStart;
  static $tStartQ;
  $tS = microtime(true);
  $tElapsedSecs = $tS - $tRecordStart;
  $tElapsedSecsQ = $tS - $tStartQ;
  $sElapsedSecs = str_pad(number_format($tElapsedSecs, 3), 10, " ", STR_PAD_LEFT);
  $sElapsedSecsQ = number_format($tElapsedSecsQ, 3);
  echo "//".$sElapsedSecs." - ".$sName;
  if (!empty($tStartQ)) echo " In ".$sElapsedSecsQ."s";
  echo "\n";
  $tStartQ = $tS;
}

想要记录时间的流逝，你可以这样做:

recordTime("What We Just Did")

例如:

recordTime("Something Else")
//Do really long operation.
recordTime("Really Long Operation")
//Do a short operation.
recordTime("A Short Operation")
//In a while loop.
for ($i = 0; $i < 300; $i ++) {
  recordTime("Loop Cycle ".$i)
}

给出如下输出:

//     0.000 - Start
//     0.001 - Something Else In 0.001s
//    10.779 - Really Long Operation In 10.778s
//    11.986 - A Short Operation In 1.207s
//    11.987 - Loop Cycle 0 In 0.001s
//    11.987 - Loop Cycle 1 In 0.000s
...
//    12.007 - Loop Cycle 299 In 0.000s

希望这能帮助到一些人!

这里有一个函数，可以计时PHP代码的任何部分的执行，很像Python的timeit模块:https://gist.github.com/flaviovs/35aab0e85852e548a60a

如何使用:

include('timeit.php');
const SOME_CODE = '
        strlen("foo bar");
';
$t = timeit(SOME_CODE);
print "$t[0] loops; $t[2] per loop\n";

结果:

$ php x.php 
100000 loops; 18.08us per loop

免责声明:我是本文主旨的作者

EDIT: timeit现在是https://github.com/flaviovs/timeit上一个独立的、独立的项目

如果你想以秒为单位显示时间:

<?php

class debugTimer
{
    private $startTime;
    private $callsCounter;

    function __construct()
    {
        $this->startTime = microtime(true);
        $this->callsCounter = 0;
    }

    public function getTimer(): float
    {
        $timeEnd = microtime(true);
        $time = $timeEnd - $this->startTime;
        $this->callsCounter++;
        return $time;
    }

    public function getCallsNumber(): int
    {
        return $this->callsCounter;
    }
}

$timer = new debugTimer();
usleep(100);
echo '<br />\n
    ' . $timer->getTimer() . ' seconds before call #' . $timer->getCallsNumber();

usleep(100);
echo '<br />\n
    ' . $timer->getTimer() . ' seconds before call #' . $timer->getCallsNumber();

下面是一个返回小数秒的实现(即1.321秒)

/**
 * MICROSECOND STOPWATCH FOR PHP
 *
 * Class FnxStopwatch
 */
class FnxStopwatch
{
    /** @var float */
    private $start,
            $stop;

    public function start()
    {
        $this->start = self::microtime_float();
    }
    public function stop()
    {
        $this->stop = self::microtime_float();
    }
    public function getIntervalSeconds() : float
    {
        // NOT STARTED
        if (empty($this->start))
            return 0;
        // NOT STOPPED
        if (empty($this->stop))
            return ($this->stop - self::microtime_float());

        return $interval = $this->stop - $this->start;
    }

    /**
     * FOR MORE INFO SEE http://us.php.net/microtime
     *
     * @return float
     */
    private static function microtime_float() : float
    {
        list($usec, $sec) = explode(" ", microtime());

        return ((float)$usec + (float)$sec);
    }
}

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

// 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";
?>

这是这个的链接