astra_adjust_brightness( string $hex, number $steps, string $type )

	function astra_adjust_brightness( $hex, $steps, $type ) {

		// Get rgb vars.
		$hex = str_replace( '#', '', $hex );

		// Return if non hex.
		if ( ! ctype_xdigit( $hex ) ) {
			return $hex;
		}

		$shortcode_atts = array(
			'r' => hexdec( substr( $hex, 0, 2 ) ),
			'g' => hexdec( substr( $hex, 2, 2 ) ),
			'b' => hexdec( substr( $hex, 4, 2 ) ),
		);

		// Should we darken the color?
		if ( 'reverse' == $type && $shortcode_atts['r'] + $shortcode_atts['g'] + $shortcode_atts['b'] > 382 ) {
			$steps = -$steps;
		} elseif ( 'darken' == $type ) {
			$steps = -$steps;
		}

		// Build the new color.
		$steps = max( -255, min( 255, $steps ) );

		$shortcode_atts['r'] = max( 0, min( 255, $shortcode_atts['r'] + $steps ) );
		$shortcode_atts['g'] = max( 0, min( 255, $shortcode_atts['g'] + $steps ) );
		$shortcode_atts['b'] = max( 0, min( 255, $shortcode_atts['b'] + $steps ) );

		$r_hex = str_pad( dechex( $shortcode_atts['r'] ), 2, '0', STR_PAD_LEFT );
		$g_hex = str_pad( dechex( $shortcode_atts['g'] ), 2, '0', STR_PAD_LEFT );
		$b_hex = str_pad( dechex( $shortcode_atts['b'] ), 2, '0', STR_PAD_LEFT );

		return '#' . $r_hex . $g_hex . $b_hex;
	}