PHP adds watermarks at different locations according to the color boundary of the image

function add_wm($nmw_water, $src_file, $output_file, $x, $y) {      
    if(file_exists($output_file))      
        return;      
                      
    $w1 = MagickGetImageWidth($nmw_water);      
    $h1 = MagickGetImageHeight($nmw_water);      
                      
    $nmw =NewMagickWand();      
    MagickReadImage($nmw, $src_file);      
                      
    // 默认的加水印位置调整      
    $lt_w = 50;      
    $lt_h = 50;      
                      
    if($x == 0){      
        $w = MagickGetImageWidth($nmw);      
        $h = MagickGetImageHeight($nmw);      
                      
        $x = $w;      
        $y = $h;      
    }else{      
        // 根据具体情况调整      
        $lt_w = 30;      
        $lt_h = 40;      
    }      
                      
    MagickCompositeImage($nmw, $nmw_water, MW_OverCompositeOp, $x - $w1 - $lt_w, $y - $h1 - $lt_h);      
    MagickWriteImage($nmw, $output_file);      
                      
    DestroyMagickWand($nmw);              
}      
                      
// 还是groovy的eachFileRecurse好用啊      
function add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr) {      
    $dp = dir($to_dir);      
    while($file=$dp->read()){      
        if($file != '.' && $file != '..'){      
                  
                  
            if(is_dir($to_dir . '/' . $file)){      
                mkdir($output_dir . '/' . $file);      
                add_wm_recurse($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $arr);      
            }else{      
                if(!array_key_exists($to_dir . '/' . $file, $arr)){      
                    continue;      
                  
                }      
                      
                $sub_arr = $arr[$to_dir . '/' . $file];      
                if($sub_arr){      
                    $x = intval($sub_arr[0]);      
                    $y = intval($sub_arr[1]);      
                    add_wm($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $x, $y);      
                }      
            }      
        }      
    }      
    $dp->close();      
}      
                      
$to_dir = './resized';      
$output_dir = './output';      
                      
// 这个是我用java的ImageIO遍历图片像素获取的符合裤子颜色的区域的坐标array(posX, posY)      
$arr = array(      
    array(50, 50)      
);      
                      
$water = './water.png';      
$nmw_water =NewMagickWand();      
MagickReadImage($nmw_water, $water);      
                      
add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr);      
                      
DestroyMagickWand($nmw_water);