How do I add an extra 0 for the cent amount in dollars in php? [closed]

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$dollar_amount_purchased = $dollar_amount_purchased + "0";

I tr开发者_Python百科ied the above code but it's not working. How am I supposed to do this in php?

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http://php.net/manual/en/function.money-format.php

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You should have a look at http://php.net/manual/en/function.number-format.php

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Format numbers for display with number_format. The first parameter is how many decimal places you want to show. If you specify 2 and the number does not have a tenths or hundredths place, it'll get padded with 0s automatically.

echo '$' . number_format($dollar_amount_purchased, 2, '.', ',');