float precision format not being kept

I have a list of floats that I need to put into an array, when I put them into an array manually the floats lose their format, for example: $a = array(1=>3.50807443617658E-4); print $a[1] returns: 0.00035080744361766 I'm familiar with round() and all the math functions, but I'm stumped. Any light anyone can shed on this would be appreciated. ;) Thanks, ~Rob Yelvington