php中Hex RGB顏色值如何互換

小編給大家分享一下php中Hex RGB顏色值如何互換，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！

代碼如下:

<?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;
}
?>

以上是“php中Hex RGB顏色值如何互換”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！