How to find php execution time? [duplicate]

问题

This question already has answers here:

Tracking the script execution time in PHP (19 answers)

Closed 7 years ago.

I have a large PHP code in my website, I want to know the execution time of processing. How can I do this?

<?php
// large code
// large code
// large code

// print execution time here
?>

回答1:

You can use microtime as the start and end of your PHP code:

<?php
    $time_start = microtime(true);
    sleep(1);
    $time_end = microtime(true);
    $time = $time_end - $time_start;
    echo "Process Time: {$time}";
    // Process Time: 1.0000340938568
?>

As of PHP 5.4.0, there is no need to get start time at the beginning, the $_SERVER superglobal array already has it:

<?php
    sleep(1);
    $time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];
    echo "Process Time: {$time}";
    // Process Time: 1.0061590671539
?>

来源：https://stackoverflow.com/questions/17035859/how-to-find-php-execution-time