PHP - How to Rename an Image File on Upload

Question

This is a complete script I am using that creates 3 different re-sized images from my original upload. Right now it renames the 3 output files with their size plus the original image file name. I want to rename the images with the size BUT change it to a different name that would be a value in a string called.

$ListingId= $_GET['ListingId']; (I'm grabbing the value from the url)

This is my index page

    <?php
    include( 'function.php');
    // settings
    $max_file_size = 1024*200; // 200kb
    $valid_exts = array('jpeg', 'jpg', 'png', 'gif');
    // thumbnail sizes
    $sizes = array(100 => 100, 150 => 150, 250 => 250);

    if ($_SERVER['REQUEST_METHOD'] == 'POST' AND isset($_FILES['image'])) {
      if( $_FILES['image']['size'] < $max_file_size ){
        // get file extension
        $ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
        if (in_array($ext, $valid_exts)) {
          /* resize image */
          foreach ($sizes as $w => $h) {
            $files[] = resize($w, $h);
          }

        } else {
          $msg = 'Unsupported file';
        }
      } else{
        $msg = 'Please upload image smaller than 200KB';
      }
    }
    ?>
    <html>
    <head>
      <title>Image resize while uploadin</title>
    <head>
    <body>
      <!-- file uploading form -->
      <form action="" method="post" enctype="multipart/form-data">
        <label>
          <span>Choose image</span>
          <input type="file" name="image" accept="image/*" />
        </label>
        <input type="submit" value="Upload" />
      </form>
    </body>
    </html>

This is the function.php code

    /**
     * Image resize
     * @param int $width
     * @param int $height
     */
    function resize($width, $height){
      /* Get original image x y*/
      list($w, $h) = getimagesize($_FILES['image']['tmp_name']);
      /* calculate new image size with ratio */
      $ratio = max($width/$w, $height/$h);
      $h = ceil($height / $ratio);
      $x = ($w - $width / $ratio) / 2;
      $w = ceil($width / $ratio);
      /* new file name */
      $path = 'uploads/'.$width.'x'.$height.'_'.$_FILES['image']['name'];
      /* read binary data from image file */
      $imgString = file_get_contents($_FILES['image']['tmp_name']);
      /* create image from string */
      $image = imagecreatefromstring($imgString);
      $tmp = imagecreatetruecolor($width, $height);
      imagecopyresampled($tmp, $image,
        0, 0,
        $x, 0,
        $width, $height,
        $w, $h);
      /* Save image */
      switch ($_FILES['image']['type']) {
        case 'image/jpeg':
          imagejpeg($tmp, $path, 100);
          break;
        case 'image/png':
          imagepng($tmp, $path, 0);
          break;
        case 'image/gif':
          imagegif($tmp, $path);
          break;
        default:
          exit;
          break;
      }
      return $path;
      /* cleanup memory */
      imagedestroy($image);
      imagedestroy($tmp);
     }

Any help is greatly appreciated! Credit to the original writer of the code Resalat Haque.

Tristan · Accepted Answer · 2015-11-16T03:29:44.537

The new file name is set in the resize() function to the width and height and uploaded file name.

/* new file name */
$path = 'uploads/'.$width.'x'.$height.'_'.$_FILES['image']['name'];

If you want to rename it you can pass the new name to the resize() function and change the function to

function resize($width, $height, $newFileName){
  /* Get original image x y*/
  list($w, $h) = getimagesize($_FILES['image']['tmp_name']);
  /* calculate new image size with ratio */
  $ratio = max($width/$w, $height/$h);
  $h = ceil($height / $ratio);
  $x = ($w - $width / $ratio) / 2;
  $w = ceil($width / $ratio);
  /* new file name */
  $path = 'uploads/'.$width.'x'.$height.'_'.$newFileName;
  /* read binary data from image file */
  $imgString = file_get_contents($_FILES['image']['tmp_name']);
  /* create image from string */
  $image = imagecreatefromstring($imgString);
  $tmp = imagecreatetruecolor($width, $height);
  imagecopyresampled($tmp, $image,
  0, 0,
  $x, 0,
  $width, $height,
  $w, $h);
  /* Save image */
  switch ($_FILES['image']['type']) {
    case 'image/jpeg':
      imagejpeg($tmp, $path.'.jpg', 100);
      break;
    case 'image/png':
      imagepng($tmp, $path.'.png', 0);
      break;
    case 'image/gif':
      imagegif($tmp, $path.'.gif');
      break;
    default:
      exit;
      break;
  }
  return $path;
  /* cleanup memory */
  imagedestroy($image);
  imagedestroy($tmp);
}

Change the function call to:

$newFileName = 'newName'; // set to your desired value
/* resize image */
foreach ($sizes as $w => $h) {
   $files[] = resize($w, $h, $newFileName);
}

Edit: Also need to add the file type extension to $path in the switch.

Thanks for the quick response Tristan! I implemented your code and it renamed the file thank you! However the new file name does not include the .jpg extension when I looked at it on the server (original file was a .jpg), can you explain how to add that to the name? — shakkashawn, Nov 16 '15 at 03:26
Quite right. I edited the answer to reflect the change. Easiest to just add the extension in the switch. — Tristan, Nov 16 '15 at 03:30

PHP - How to Rename an Image File on Upload

1 Answers1