Question

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Simplest way to profile a PHP script

Sometimes my website loads slowly and I would like to trace which function causes it. (or if it is related to me or the webserver)
How can I get execution times of each function that is being run?

Like;

<?php
function A() { }
function B() { }
function C() { }
A();
B();

Trace();
?>

Trace() would output: A ran in 0,1 miliseconds, B ran in 1,1 seconds, script completed.
Is there any debugging feature like this in PHP?

Ps. I’m not speaking about applying microtime for each function.

Answer 1

Use:

• XHProf if you need to profile in production environments. It has a footprint, but it’s usually affordable. It does not produce trace if the script ends unexpectedly though.

• XDebug if you want to profile in development and testing environments. It’s generally more reliable, but has a noticeable footprint; long running scripts will generate very large (100s MBs) files for instance, as opposed to XHProf.

Don’t use:

• APD, because even though it’s recommended in this answer, it’s very outdated and doesn’t look like it’s being developed anymore (last release in 2004 according to its PECL page)

PS: My personal recommendation: Play with them all if you have the time to do so, or just set up xdebug in your dev environment otherwise.