A function attempting to rudimentary replicate SASS lighten/darken functions. Adapted from Frxstrem's answer on StackOverflow: http://stackoverflow.com/questions/3512311/how-to-generate-lighter-darker-color-with-php

sass_colorfunctions.php

<?php
function sass_darken($hex, $percent) {
    preg_match('/^#?([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i', $hex, $primary_colors);
	str_replace('%', '', $percent);
	$color = "#";
	for($i = 1; $i <= 3; $i++) {
		$primary_colors[$i] = hexdec($primary_colors[$i]);
		$primary_colors[$i] = round($primary_colors[$i] * (100-($percent*2))/100);
		$color .= str_pad(dechex($primary_colors[$i]), 2, '0', STR_PAD_LEFT);
	}

	return $color;
}

function sass_lighten($hex, $percent) {
	preg_match('/^#?([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i', $hex, $primary_colors);
	str_replace('%', '', $percent);
	$color = "#";
	for($i = 1; $i <= 3; $i++) {
		$primary_colors[$i] = hexdec($primary_colors[$i]);
		$primary_colors[$i] = round($primary_colors[$i] * (100+($percent*2))/100);
		$color .= str_pad(dechex($primary_colors[$i]), 2, '0', STR_PAD_LEFT);
	}

	return $color;
}
?>

Cool.

Cool

Thanks ;)

Thanks man ;)

Thanks! I have found a little bug, new values must have limited like this:
$primary_colors[$i] = $primary_colors[$i] > 255 ? 255 : $primary_colors[$i];