如何使用number_format从价格中删除小数

I would like to know if anyone can tell me how I delete the decimals from the price of the ads on my site.

I have a free classifieds website, but I can not understand how to delete decimals. I do not need them

For example:

If the price of an object is 100 $ Currently it is shown as 100.00 $

I'm interested in eliminating the last few decimals, so you always have the $ 100 price

I think it's the number_format to change or I do not know, I've tried various changes.

Generally how do you change?

My site is visible here annuncigratuiti.com

$var = number_format($var, 0, '.', ''); 

echo $var;

but it return as string, to make it as float :

$var = (float)number_format($var, 0, '.', '');