Convert hexadecimal color to rgb or rgba in php

Below PHP helper function converts hex color code string into RGB or RGBA color.

Code

    /**
     * Convert hexadecimal color to rgb or rgba
     *
     * @param string $color
     * @param boolean $getRGBA
     * @param float $opacity
     * @return string
     */
    function hex2rgba(
        string $color,
        bool $getRGBA = true,
        float $opacity = 1
    ): string {
        $output = 'rgb(0,0,0)';

        // Return default color if no color is provided
        if (!$color) {
            return $output;
        }

        // 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 = [
                $color[0] . $color[1],
                $color[2] . $color[3],
                $color[4] . $color[5],
            ];
        } elseif (strlen($color) == 3) {
            $hex = [
                $color[0] . $color[0],
                $color[1] . $color[1],
                $color[2] . $color[2],
            ];
        } else {
            return $output;
        }

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

        //Check for opacity(rgba or rgb)
        if ($getRGBA) {
            $rgb[] = (abs($opacity) > 1) ? 1 : $opacity;
            $output = 'rgba(';
        } else {
            $output = 'rgb(';
        }

        $output .= implode(',', $rgb) . ')';
        //return rgb(a) color string
        return $output;
    }