获取图片主要颜色

<?php
function get_image_color($img) {
	$img=imagecreatefromjpeg($img);  
    $w = imagesx($img);
    $h = imagesy($img);
    $r=$g=$b=0;
    for($y=0; $y < $h; $y++) {
        for($x = 0; $x < $w; $x++) {
            $rgb = imagecolorat($img, $x, $y);
            $r += $rgb >> 16;
            $g += $rgb >> 8 & 255;
            $b += $rgb & 255;
        }
    }
    $pxls = $w * $h;
    $r = dechex(round($r / $pxls));
    $g = dechex(round($g / $pxls));
    $b = dechex(round($b / $pxls));
    if(strlen($r) < 2)$r = 0 . $r;
    if(strlen($g) < 2)$g = 0 . $g;
    if(strlen($b) < 2)$b = 0 . $b;
    return "#" . $r . $g . $b;
}
$color=get_image_color("color2.jpg");
echo "<div style='background:$color;width:100px;height:100px;'></div><img src='color2.jpg' />";