PHP out of memory and killing PHP process about pdf-to-image HOT 6 CLOSED

    $client = new Client(env('DROPBOX_ACCESS_TOKEN', config('dropbox.access_token')), env('DROPBOX_APP_SECRET', config('dropbox.app_secret')));

    $adapter = new DropboxAdapter($client);

    $filesystem = new Filesystem($adapter);

    $Image = new Image();

    echo Utility::bytesToHuman(memory_get_usage(true)) . " All Objects are creating except PDF library Image " . PHP_EOL;

    Dropbox::where('is_process', 0)->where('type', 'file')->chunk(200, function ($dropboxArr) use ($filesystem, $Image) {
        ;

        echo Utility::bytesToHuman(memory_get_usage(true)) . " Dropbox Model Chunk Query started " . PHP_EOL;


        foreach ($dropboxArr as $row) {

            /**
             * Art Creation Process
             *
             */
            echo Utility::bytesToHuman(memory_get_usage(true)) . " First Loop started with file path " . $row->path . " " . PHP_EOL;


            $art = Art::where('folder', $row->folder)->get()->first();

            if (empty($art)) {

                $maxCode = (Art::max('code') + 1);
                $art = [
                    'title' => $row->folder,
                    'code' => $maxCode,
                    'folder' => $row->folder
                ];

                Art::create($art);
            }

            echo Utility::bytesToHuman(memory_get_usage(true)) . " Art First Query process in loop " . PHP_EOL;

            /**
             * Print Checking & Create Process
             *
             */

            $print = Prnt::select('id', 'title', 'code')->where('title', trim($row->filename))->get()->first();

            echo Utility::bytesToHuman(memory_get_usage(true)) . " Print 2nd Query process in loop " . PHP_EOL;


            if (empty($print)) {
                $maxCode = (Prnt::max('code') + 1);


                /**
                 * Link Shared Process
                 *
                 */


                $curl = curl_init();

                curl_setopt_array($curl, array(
                    CURLOPT_URL => "https://api.dropboxapi.com/2/sharing/create_shared_link",
                    CURLOPT_RETURNTRANSFER => true,
                    CURLOPT_ENCODING => "",
                    CURLOPT_MAXREDIRS => 10,
                    CURLOPT_TIMEOUT => 30,
                    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
                    CURLOPT_CUSTOMREQUEST => "POST",
                    CURLOPT_POSTFIELDS => json_encode(array('path' => "/" . $row->path)),
                    CURLOPT_HTTPHEADER => array(
                        "authorization: Bearer " . env('DROPBOX_ACCESS_TOKEN', config('dropbox.access_token')),
                        "content-type: application/json"
                    ),
                ));

                $response = curl_exec($curl);
                $err = curl_error($curl);

                curl_close($curl);

                if ($err) {

                } else {
                    $shared_link = json_decode($response);
                }

                echo Utility::bytesToHuman(memory_get_usage(true)) . " Dropbox shared link generation process in loop " . PHP_EOL;

                /**
                 * Image Creation Process
                 *
                 */

                $fileExt = $row->extension;

                $file = $filesystem->read(strtolower($row->path));

                if (!empty($file)) {

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " Dropbox file read process in loop " . PHP_EOL;

                    Storage::put('sync.' . $fileExt, $file);

                    $filePath = storage_path('app/sync.' . $fileExt);

                    $pdf = new Pdf($filePath);

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " PDF object created in loop " . PHP_EOL;

                    $savePath = public_path('sync-mblob.jpg');

                    $pdf->saveImage($savePath);


                    $Image->make(public_path('sync-mblob.jpg'))->resize(150, 150)->save(public_path('sync-blob.jpg'));

                    /**
                     * Print Creation Process
                     *
                     */

                    $print = [
                        'title' => trim($row->filename),
                        'code' => $maxCode,
                        'sample' => file_get_contents(public_path('sync-mblob.jpg')),
                        'thumbnail' => file_get_contents(public_path('sync-blob.jpg')),
                        'preview_url' => @$shared_link->url
                    ];

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " File get content method for both sample and thumb process in loop " . PHP_EOL;


                    $print = Prnt::create($print);


                    echo Utility::bytesToHuman(memory_get_usage(true)) . " Prnt record insert process in loop " . PHP_EOL;


                    $art = Art::where('folder', $row->folder)->get()->first();

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " Art condition check process in loop " . PHP_EOL;

                    $art->prints()->attach([$print->id]);


                    Dropbox::where('id', $row->id)->update(['is_process' => 1]);

                    unset($pdf); //Removing the PDF Object to clear the memory consumption issue.

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " PDF Object unset in loop to clear memory" . PHP_EOL;
                } else {
                    echo Utility::bytesToHuman(memory_get_usage(true)) . " file was empty moving to next file " . PHP_EOL;
                }
            }
        }
    });
}

                    echo Utility::bytesToHuman(memory_get_usage(true)) . " PDF object created in loop " . PHP_EOL;

                    $savePath = public_path('sync-mblob.jpg');

                    $pdf->saveImage($savePath);`