In some games you see those graphical bars which show your experience or your hp/life ..etc

How can i make something like that in php?

I dont know the exact code to do it but I think its done by using an image of what ever you want the bar to look like and then applying a width % value to it. Thats how some voting bars are made so i guess you can use it for representing anything else you like as well.

so say you want to represent 50% hp you could have an image the side 50 pixels wide have a width value of 50% then it would be halfed to 25 pixels when displayed.

<img src='imagebar.gif' width='"<?php echo $hp_level ?>"'

$hp_level should = number+percent symbol (50%).