Calculate how long a page takes to load with a page timer

To measure the time of a page, query, or whatever you want to measure you need to set up a timer first and then check it.

You will need these two functions:

function TimerStart() {
    // Load this right at the start of the process you want to time
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

function TimerEnd($timerStart) {
    list($usec, $sec) = explode(" ", microtime());
    $timerEnd = ((float)$usec + (float)$sec);

    $timeTaken = $timerEnd - $timerStart;
    $timeTaken = number_format($timeTaken, 4, '.', '');

    return $timeTaken;
}

Here is an example of how you would use the timer:

///////////////////////////////////
// Calculate SHA1 hashes

$timer = TimerStart();

for ($i = 1; $i < = 100000; $i++) {
    $tmp = sha1($i);
}

$timerSha1 = TimerStop($timer);


///////////////////////////////////
// Calculate MD5 hashes

$timer = TimerStart();

for ($i = 1; $i <= 100000; $i++) {
    $tmp = md5($i);
}

$timerMD5 = TimerStop($timer);

echo "SHA1 generation time: <strong>$timerSha1 seconds<br />";
echo "MD5 generation time: <strong>$timerMD5</strong> seconds<br />";

/*
Output:

SHA1 generation time: 0.6527 seconds
MD5 generation time: 0.5495 seconds

*/