Question

Is it possible to know the time taken by Apache server to load a PHP page? Is there any log file generated inside Apache server for every page which is running under Apache server?

Answer 1

I’m going to assume you wish to know how long it took for PHP to generate the page.

When the script starts, since 5.1, there’s an entry in $_SERVER you can use, called REQUEST_TIME. It contains the time when the request was started. At the end of your script you can calculate it like so:

$time_taken = time() - $_SERVER['REQUEST_TIME'];

Obviously, this is not very accurate and therefore the newer REQUEST_TIME_FLOAT was introduced in PHP 5.4:

$time_taken = microtime(true) - $_SERVER['REQUEST_TIME_FLOAT'];

For < 5.4 you could use this snippet at the beginning of your script for backwards compatibility:

if (!isset($_SERVER['REQUEST_TIME_FLOAT'])) {
    $_SERVER['REQUEST_TIME_FLOAT'] = microtime(true);
}

Update

To let Apache do this for you, you can add the %T and/or %D log format option, e.g.

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" **%T/%D**" combined

The %T option lets you log the number of seconds taken and %D logs the microseconds (since Apache 2).

See also: How long does it take to serve a request