php有没有图片相似性检测的插件？

<?php
echo "图1<img width=\"100\" src='/asset/testimg1.png' /></br>";
echo "图2<img width=\"100\" src='/asset/testimg2.png' /></br>";
echo "图3<img width=\"100\" src='/asset/testimg3.png' /></br>";
echo "图1与图2是否相似";
$aHash = ImageHash::hashImageFile('/data/wwwroot/default/asset/testimg1.png');
$bHash = ImageHash::hashImageFile('/data/wwwroot/default/asset/testimg2.png');
var_dump(ImageHash::isHashSimilar($aHash, $bHash));
echo "</br>";

echo "图1与图2是否相似";
$aHash = ImageHash::hashImageFile('/data/wwwroot/default/asset/testimg1.png');
$bHash = ImageHash::hashImageFile('/data/wwwroot/default/asset/testimg3.png');
var_dump(ImageHash::isHashSimilar($aHash, $bHash));


/**
* 图片相似度比较

* //Sample_1
* $aHash = ImageHash::hashImageFile('wsz.11.jpg');
* $bHash = ImageHash::hashImageFile('wsz.12.jpg');
* var_dump(ImageHash::isHashSimilar($aHash, $bHash));

* //Sample_2
* var_dump(ImageHash::isImageFileSimilar('wsz.11.jpg', 'wsz.12.jpg'));
*/
class ImageHash {
    /**取样倍率 1~10  数值越高匹配越准确
    * @access public
    * @staticvar int
    * */
    public static $rate = 2;
    /**相似度允许值 0~64 数值越高 匹配精度越准确
    * @access public
    * @staticvar int
    * */
    public static $similarity = 60;
    /**图片类型对应的开启函数
    * @access private
    * @staticvar string
    * */
    private static $_createFunc = array(
        IMAGETYPE_GIF => 'imageCreateFromGIF',
        IMAGETYPE_JPEG => 'imageCreateFromJPEG',
        IMAGETYPE_PNG => 'imageCreateFromPNG',
        IMAGETYPE_BMP => 'imageCreateFromBMP',
        IMAGETYPE_WBMP => 'imageCreateFromWBMP',
        IMAGETYPE_XBM => 'imageCreateFromXBM',
    );
    /**比较两个图片文件，是不是相似
    * @param string $aHash A图片的路径
    * @param string $bHash B图片的路径
    * @return bool 当图片相似则传递 true，否则是 false
    * */
    p...

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