function hex2rgb( $colour ) { 
    if ( $colour[0] == '#' ) { 
        $colour = substr( $colour, 1 ); 
    } 
    if ( strlen( $colour ) == 6 ) { 
        list( $r, $g, $b ) = array( $colour[0] . $colour[1], $colour[2] . $colour[3], $colour[4] . $colour[5] ); 
    } elseif ( strlen( $colour ) == 3 ) { 
        list( $r, $g, $b ) = array( $colour[0] . $colour[0], $colour[1] . $colour[1], $colour[2] . $colour[2] ); 
    } else { 
        return false; 
    } 
    $r = hexdec( $r ); 
    $g = hexdec( $g ); 
    $b = hexdec( $b ); 
    return array( 'red' => $r, 'green' => $g, 'blue' => $b ); 
} 
//测试 
var_dump(hex2rgb("#eeeeee"));

array(3) {
 ["red"]=>
 int(238)
 ["green"]=>
 int(238)
 ["blue"]=>
 int(238)
}