Convert hexdec color string to rgb(a) string

hexdec-to-rgba.php

<?
/* Convert hexdec color string to rgb(a) string */
	function hex2rgba($color, $opacity = false) {

		$default = 'rgb(0,0,0)';

		//Return default if no color provided
		if (empty($color)) return $default;

		//Sanitize $color if "#" is provided
		if ($color[0] == '#') {
			$color = substr($color, 1);
		}

		//Check if color has 6 or 3 characters and get values
		if (strlen($color) == 6) {
			$hex = array(
					$color[0].$color[1],
					$color[2].$color[3],
					$color[4].$color[5]
			);
		}
		elseif (strlen($color) == 3) {
			$hex = array(
					$color[0].$color[0],
					$color[1].$color[1],
					$color[2].$color[2]
			);
		}
		else {
			return $default;
		}

		//Convert hexadec to rgb
		$rgb = array_map('hexdec', $hex);

		//Check if opacity is set(rgba or rgb)
		if ($opacity) {
			if (abs($opacity) > 1) $opacity = 1.0;
			$output = 'rgba('.implode(",", $rgb).','.$opacity.')';
		}
		else {
			$output = 'rgb('.implode(",", $rgb).')';
		}

		//Return rgb(a) color string
		return $output;