PHP String to Float -

I'm not familiar with PHP and have a quick question.

I have a value of 2 variables @ peerutite and @ViSSeGians, which is setting them on values:

  $ invoice units = ((string) $ invoice line item - & gt; Involved Units); $ Value PerUnit = ((string) $ invoice line item-> gt; PricePerUnit);  

If I output it, then I get the correct value. Come get 5000 invoice units and 1.00 for the price.

Now, I have to show the total amount spent

But I have no clue how to parse / cast / convert variables into PHP.

What should I do?

$ rootbeer = (float) $ InvoicedUnits;

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