MODX resizeImage Snippet (modern pthumb replacement with srcset generation and very low options, but works on IONOS too)

resizeImage.php

<?php

# vars
$lib = $modx->getOption("resizeImage_imageLib", null, "cli");
$libPath = $modx->getOption("resizeImage_imageLibPath", null, "/Applications/MAMP/Library/bin/convert");
$mode = $modx->getOption("mode", $scriptProperties, "");
$input = $modx->getOption("input", $scriptProperties, "");
$sizes = $modx->getOption("options", $scriptProperties, "");
$quality = $modx->getOption("quality", $scriptProperties, 70);
$cultureKey = $modx->getOption("cultureKey");
$basePath = $modx->getOption("base_path");
$filePath = preg_replace("/^\/?" . $cultureKey . "\//i", "", $input);
$filePathLast = $filePath;
$cachePath = $modx->getOption("cachePath", $scriptProperties, "assets/image-cache/");
$srcsets = [];
$src = [];

# original image not exists
if (!file_exists($basePath . $filePath)) {
    return $input;
}

# loop sizes
$sizes = explode(",", $sizes);
natsort($sizes);
foreach (array_reverse($sizes) as $size) {
    list($width, $height) = explode("x", $size);
    $filePathInfo = pathinfo($filePath);
    $savePathExtension = "." . substr(md5($filePathLast), 0, 8) . "." . $width . "x" . $height . "-" . $quality . ".webp";
    $savePath = $cachePath . $filePathInfo["filename"] . $savePathExtension;    
    
    # check if base image exists
    if (!file_exists($basePath . $filePathLast) || filesize($basePath . $filePathLast) < 1) {
        $filePathLast = $filePath;
    }
    
    # image already saved
    if (!file_exists($basePath . $savePath)) {
        
        # check if cache dir exists
        if (!is_dir($basePath . $cachePath)) {
            mkdir($basePath . $cachePath, 0755);
        } else {
        
            # cleanup cache
            foreach (glob($basePath . $cachePath . "*.webp") as $file) {
                if (filemtime($file) < time() - (60 * 60 * 24 * 30)) {
                    unlink($file);
                }
            }
        
        }
    
        # generate image on IONOS via cli
        if ($lib == "cli") {
            
            $resize = "-resize " . ( $width ?? "" ) . "x" . ( $height ?? "" );
            
            if ($width && $height) {
                $resize = "-resize " . $width . "x" . $height . "^ -gravity center -extent " . $width . "x" . $height;
            }
            
            $cmd = "export OMP_NUM_THREADS=1;"; // bugfixes IONOS resize large images, thanks to https://stackoverflow.com/a/69133237
            $cmd .= $libPath . " " . $basePath . $filePathLast . " " . $resize . "  -quality " . $quality . " " . $basePath . $savePath;
            
            shell_exec($cmd);
        
        } else {
            
            $image = new Imagick($basePath . $filePathLast);
            
            if ($width && $height) {
                $image->cropThumbnailImage((int) $width, (int) $height);
            } else {
                $image->thumbnailImage((int) $width, (int) $height);
            }
            
            $image->setImageCompressionQuality($quality);
            $image->writeImage($basePath . $savePath);
        
        }
    
    }
        
    # get generated image    
    if (file_exists($basePath . $savePath)) {
        list($width, $height) = getimagesize($basePath . $savePath);
        $srcsets[] = [
            "url" => $savePath,
            "width" => $width,
            "height" => $height
        ];
        
        # use image for next loop
        $filePathLast = $savePath;
    }
}

# generate srcset
foreach ($srcsets as $srcset) {
    $src[] = $srcset["url"] . " " . $srcset["width"] ."w";
}

# set width and height ratio
$width = $srcsets[0]["width"];
$height = $srcsets[0]["height"];

# output as json
if ($mode == "json") {
    return json_encode([
        "url" => $input,
        "src" => implode(",", $src),
        "width" => $width,
        "height" => $height
    ]);
}

return '="' . implode(",", $src) . '" width="' . $width . '" height="' . $height . '" style="aspect-ratio: ' . $width . '/' . $height . '"';