How do you test speed of PHP code?

Question

Hi guys,
I am just beginning to learn coding. I have written two program in PHP to check for prime numbers in a loop. But I notice it takes a while to get the results. So how do I check for speed of the code? Any help to optimize the code will be appreciated. I am a newbie so my code is probably very very basic.

https://code.sololearn.com/w8IqRFfQEaQX/#php
https://code.sololearn.com/wnCnzqCf973a/#php

Answer 1

Not sure. But you should definitely start working on your computer. It's much better. I'm sure the online program has some limitations.

Answer 2

There are many tools made to measure it. You can also use XDebug because it logs your time.

Answer 3

Thank you Ben, it probably does have limitations. As I said... I am quite new to coding. This is just my second code on php...

Answer 4

I actually use an online site to write the PHP codes. (http://sandbox.onlinephpfunctions.com/) So using tools or the Xdebug program won't work for me at the moment. But I will keep these things in mind for later.

Is there a way by code I can check for speed?