Convert HEX color to RGB(A)

convert-hex-rgba.php

<?php

/**
* Converts HEX color code to RGB(A)
* @param string $color
* @param int $opacity
* @return string
*/

function hex2rgba ($color, $opacity = false) 
{
 
	$default = 'rgb(0,0,0)';

	if (empty($color))
		return $default; 

	if ($color[0] == '#')
		$color = substr($color, 1);

	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;

	$rgb = array_map('hexdec', $hex);

	if (!$opacity)
		return 'rgb('.implode(",",$rgb).')';

	if (abs($opacity) > 1)
		$opacity = 1.0;

	return 'rgba('.implode(",",$rgb).','.$opacity.')';

}