Creating Thumbnails for jpg, gif, png?

[glassfish]

Does anybody know a good tutorial for creating thumbnails for these three file extensions "jpg, gif and png" in PHP?

 

I am only finding ones for "jpg".

[Ch0cu3r]

The tutorials you're have found most likely uses the GD image extension for creating the thumbnails.

 

In that case all you need to do is swap out the jpeg functions to the gif or png equivalent

 

Such as change imagecreatefromjpeg and imagejpeg functions to

• imagecreatefrompng and imagepng  - for png images
• imagecreatefromgif and imagegif - for gif images

[glassfish]

Here I found this script:

function make_thumb($src, $dest, $desired_width) {

	/* read the source image */
	$source_image = imagecreatefromjpeg($src);
	$width = imagesx($source_image);
	$height = imagesy($source_image);
	
	/* find the "desired height" of this thumbnail, relative to the desired width  */
	$desired_height = floor($height * ($desired_width / $width));
	
	/* create a new, "virtual" image */
	$virtual_image = imagecreatetruecolor($desired_width, $desired_height);
	
	/* copy source image at a resized size */
	imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
	
	/* create the physical thumbnail image to its destination */
	imagejpeg($virtual_image, $dest);
}

I found it at: http://davidwalsh.name/create-image-thumbnail-php

 

 

Can this script be modified so all three file extensions can be used?

 

Or I could be using this script three times? I will try that in a minute.

 

Thanks for the answer so far.

[Ch0cu3r]

You'd make a separate function which will determine which image functions to use depending on the image extension.

 

Example (untest code).

function getImageFunctionsByExtension($src)
{
    $extension = pathinfo($src, PATHINFO_EXTENSION);

    switch($extension)
    {
       case 'gif':
          $functions = array('imagecreatefromgif', 'imagegif');   // list of gif function names
       break;

       case 'png':
          $functions = array('imagecreatefrompng', 'imagepng');   // list of png function names
       break;

       case 'jpg':
       case 'jpeg':
          $functions = array('imagecreatefromjpeg', 'imagejpeg'); // list of jpeg function names
       break;
    }

    return $functions;
}

Now replace    $source_image = imagecreatefromjpeg($src);     with

list($imagecreatefromfunc, $imagefunc)  = getImageFunctionsByExtension($src);

$source_image = $imagecreatefromfunc($src);

And then replace   imagejpeg($virtual_image, $dest);   with    $imagefunc($virtual_image, $dest);

 

The code will now use the correct image functions based on the extension of the image.