Create Thumbnail PHP Function

Create Thumbnail PHP Function

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Have you ever needed to create thumbnails when working with PHP? This handy function will help do the job!

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function createThumbnail($src, $dest, $desiredWidth, $desiredHeight, $fileName, $fileType) {
 
 // Read the source image.
 switch ($fileType) {
 case "jpg":
 case "jpeg":
  $sourceImage = imagecreatefromjpeg($src);
  break;
 case "png":
  $sourceImage = imagecreatefrompng($src);
  break;
 case "gif":
  $sourceImage = imagecreatefromgif($src);
  break;
 }
 
 // Get the source image size.
 $width = imagesx($sourceImage);
 $height = imagesy($sourceImage);
 
 if ($width > $height) {
  $desiredHeight = floor($height * ($desiredWidth/$width));
 }
 if ($height > $width) {
  $desiredWidth = floor($width * ($desiredHeight/$height));
 }
 
 // If the source image size is bigger than the desired size, crop it.
 if ($width > $desiredWidth || $height > $desiredHeight) {
  // Create the virtual image.
  $virtualImage = imagecreatetruecolor($desiredWidth, $desiredHeight);
  // Create a copy of the source image at its desired size.
  imagecopyresampled($virtualImage, $sourceImage, 0, 0, 0, 0, $desiredWidth, $desiredHeight, $width, $height);
  // Create the physical thumbnail in the desired destination.
  switch ($fileType) {
   case "jpg":
   case "jpeg":
    return imagejpeg($virtualImage, $dest.$fileName.'.'.$fileType);
    break;
   case "png":
    return imagepng($virtualImage, $dest.$fileName.'.'.$fileType);
    break;
   case "gif":
    return imagegif($virtualImage, $dest.$fileName.'.'.$fileType);
    break;
  }
  // If the source image is smaller than the desired image, don't resample just copy the image to the desired destination.
 } else {
  copy($src,$dest.$fileName.'.'.$fileType);
 }
}

When calling this function, you need to pass in the following arguments:

  • $src – The source is the path to the image you want to create a thumbnail of.
  • $dest – The destination is the path to where you want to save the thumbnail.
  • $desiredWidth – The desired width is the width in pixels you want the thumbnail to be.
  • $desiredHeight – The desired height is the height in pixels you want the thumbnail to be.
  • $fileName – The file name is the name you want the thumbnail to have.
  • $fileType – The file type is the type of image the thumbnail should be.

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