php颜色转换函数hex-rgb(将十六进制格式转成十进制格式)

<?php   
 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 );   
}   
$b = hex2rgb ( "#ff0" );   
print_r ( $b );   
?>