/**
 * 检测图片主要颜色
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
$i = imagecreatefromjpeg("image.jpg");
for ($x=0;$x<imagesx($i);$x++) {
    for ($y=0;$y<imagesy($i);$y++) {
        $rgb = imagecolorat($i,$x,$y);
        $r   = ($rgb >> 16) & 0xFF;
        $g   = ($rgb >>  & 0xFF;
        $b   = $rgb & 0xFF;
        $rTotal += $r;
        $gTotal += $g;
        $bTotal += $b;
        $total++;
    }
}
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);


/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/