simple regex in php, formatting decimal number

Question

I need to convert numbers to have .00 after them, but only if the number is an integer, or it has just 1 number after the decimal point, like so:

1.4 = 1.40
45 = 45.00
34.77 = 34.77

What reg exp to use for this simple case?

Answer 1

You can also use printf or sprintf

printf("%01.2f", '34.77');
$formatted_num = sprintf("%01.2f", '34.77');