PHP Binary to Hex with leading zeros

Question

I have the follow code:

Which works fine, and I get a valu

Answer 1

Use str_pad() for that:

// maximum number of chars is maximum number of words 
// an integer consumes on your system
$maxchars = PHP_INT_SIZE * 2; 
$hex = str_pad($hex, $maxchars, "0", STR_PAD_LEFT);