<?php
define('UPLOAD_DIR','upload/');
 
if (isset($_POST['submit'])) {
      //file hochladen
      $tmp_name = $_FILES['img']['tmp_name']; // Der Name auf dem temporaeren Verueichnis des Servers
      $name = $_FILES['img']['name']; // Der Originalname
      $size = $_FILES['img']['size']; // Größe der Datei
            
      if ($name != '') {
            $ext_tmp = explode(".", $name);
            $ext = $ext_tmp[(count($ext_tmp)-1)];
            $extensions = array('jpg');
            if (!in_array($ext, $extensions)) {
                  $allowed_extensions = Null;
                  foreach ($extensions as $extension) {
                        $allowed_extensions .= $extension.', ';
                  }
                  die('Die Datei muss eine der folgenden Endungen haben: <br />'.$allowed_extensions);
            }
            
            if ($size != 0) {
                  if (move_uploaded_file($tmp_name, UPLOAD_DIR.$name)) {
                        $file = UPLOAD_DIR.$name;
                        chmod($file, 0755);
                        $size = getimagesize($file);
                        
                        $c_width = (!isset($_POST['width']) or $_POST['width'] == 0 or $_POST['width'] >= $size[0]) ? $size[0] : $_POST['width'];
                        $c_height = (!isset($_POST['height']) or $_POST['height'] == 0 or $_POST['height'] >= $size[0]) ? $size[0] : $_POST['height'];
                        
                        //aufrunden, da eventuell das letzte Teil halt groeßer sein muss
                        $hor_parts = ceil($size[0] / $c_width); //anzahl Teile horizontal
                        $ver_parts = ceil($size[1] / $c_height); //anzahl Teile vertikal
                        
                        $origin = ImageCreateFromJPEG($file);
                        
                        $count = 0;
                        $new_dir = UPLOAD_DIR.'/'.$name.' parts/';
                        mkdir($new_dir);
                        for ($i=0;$i<$ver_parts;$i++) {
                              for ($y=0;$y<$hor_parts;$y++) {
                                    $img = ImageCreateTruecolor($c_width,$c_height);
                                    ImageCopy($img,$origin,0,0,$y*$c_width,$i*$c_height,$c_width,$c_height);
                                    ImageJpeg($img, $new_dir.$ext_tmp[0].'-'.$count.'.'.$ext_tmp[count($ext_tmp)-1], 75);
                                    $count++;
                                    imagedestroy($img);
                              }
                        }
                  }
                  else {
                        die('Beim Hochladen ist ein Fehler aufgetreten.');
                  }
            }
      }
}
else {
      ?>
      <form method="post" action="bild_zerteilen.php" enctype="multipart/form-data">
      Bild: <input type="file" name="img" /><br />
      zerteilen in Teile mit<br />
      Breite: <input type="text" name="width" />Pixel<br />
      Höhe: <input type="text" name="height" />Höhe<br />
      <input type="submit" name="submit" value="Zerschneiden" />
      </form>
      <?php
}
 
?>