PHP - Force integer conversion to float with three decimals

Question

I am trying to convert a big array of numbers to a specific format which is +/-NNN.NNN. So, if I have these numbers:

$numbers1 = array(-1.23, 0.3222, 10, 5.5         


        

Answer 1

Try using sprintf()

$numbers2[] = sprintf("%+07.3f", $fnum);