Cast Hexadecimal Color to RGBA Color.

Cast hex to rgba Color

<?php
function hex2rgba($hex, $a = '1') {
    $hex = str_replace('#', '', $hex);

    if(strlen($hex) === 3) {
        $r = hexdec( substr($hex,0,1) . substr($hex,0,1) );
        $g = hexdec( substr($hex,1,1) . substr($hex,1,1) );
        $b = hexdec( substr($hex,2,1) . substr($hex,2,1) );
    } else {
        $r = hexdec( substr($hex,0,2) );
        $g = hexdec( substr($hex,2,2) );
        $b = hexdec( substr($hex,4,2) );
    }
    $rgba = 'rgba('.$r.', '.$g.', '.$b.', '.$a.')';
    return $rgba;
}