- var_dump: documentation ( source)
- hexdec: documentation ( source)
- sprintf: documentation ( source)
<?php
var_dump(hexdec(sprintf('#%02x%02x%02x', 127, 127, 127)));
var_dump(hexdec(sprintf('%02x%02x%02x', 127, 127, 127)));
var_dump(hexdec('cmyk(255, 255, 255, 255)'));