php_shade_color

php_shade_color.php

function shadeColor($color, $percent) {
	$num = base_convert(substr($color, 1), 16, 10);
	$amt = round(2.55 * $percent);
	$r = ($num >> 16) + $amt;
	$b = ($num >> 8 & 0x00ff) + $amt;
	$g = ($num & 0x0000ff) + $amt;
	
	return '#'.substr(base_convert(0x1000000 + ($r<255?$r<1?0:$r:255)*0x10000 + ($b<255?$b<1?0:$b:255)*0x100 + ($g<255?$g<1?0:$g:255), 10, 16), 1);
}