php Hex RGB色彩值交换的利用

复制代码 代码以下:
<?php
echo implode ( ",", HexToRGB ( "#F7F7DA" ) ) . "<br/>";
echo RGBToHex ( "rgb(247,247,218)" )?>
<?php

function HexToRGB($colour) {
    if ($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" => $b
    );
}
function RGBToHex($rgb) {
    $regexp = "/^rgb(([0-9]{0,3}),s*([0-9]{0,3}),s*([0-9]{0,3}))/";
    $re = preg_match ( $regexp, $rgb, $match );
    $re = array_shift ( $match );
    $hexColor = "#";
    $hex = array (
            "0",
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "A",
            "B",
            "C",
            "D",
            "E",
            "F"
    );
    for($i = 0; $i < 3; $i ++) {
        $r = null;
        $c = $match [$i];
        $hexAr = array ();        while ( $c > 16 ) {
            $r = $c % 16;
            $c = ($c / 16) >> 0;
            array_push ( $hexAr, $hex [$r] );
        }
        array_push ( $hexAr, $hex [$c] );        $ret = array_reverse ( $hexAr );
        $item = implode ( "", $ret );
        $item = str_pad ( $item, 2, "0", STR_PAD_LEFT );
        $hexColor .= $item;
    }
    return $hexColor;
}
?>