percentage help

[cloudll]

I have made a 'health bar' for a simple browser game i have been working on.

 

I want to use a background image to fill the health bar, so if for example, the player had full health, the health bar image width would be 100%

 

is it possible to say set, the characters max health and the characters actual health and work it out as a percentage so i can stretch the image width as far as it needs to go?

 

sorry if i haven't been too clear, my understanding of maths is not so good.

 

Thanks for any tips.

[cloudll]

edit: so i have this working now

$current_health=250;
$max_health=9999;
$health_percentage=$current_health/$max_health*100;


that works but returns the percentage with lots of decimals. is there a way to round the result up?
 

[Barand]

either of these

echo number_format($health_percentage, 2);             //  2.50
printf('%0.2f', $health_percentage);                   //  2.50