[RESOLVED] thumbnail code, to display different image types

[turtleton09]

I have some code below that is used to display resized thumbnails on the fly :

<?php
// Max Sizes
$th_max_width = 120;  // Maximum width of the thumbnail
$th_max_height = 120; // Maximum height of the thumbnail

//-------------------

// File
$filename = $_GET['file'];

// Content type
header('Content-type: image/jpeg');

// Get image sizes
list($width, $height) = getimagesize($filename);

// Resize
$ratio = ($width > $height) ? $th_max_width/$width : $th_max_height/ 
$height;
$newwidth = round($width * $ratio);
$newheight = round($height * $ratio);

// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);


//Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight,  

$width, $height);

// Output
imagejpeg($thumb);
?>

<?php
exit;
?>

But this is only for a single file type - in this case jpegs.

I've been trying to adapt it to display other image file types, but am unsure with the syntax around the three lines referencing the jpegs :

1. header('Content-type: image/jpeg');

   to :

header('Content-type: image/jpeg, image/gif, image/png etc');

?

2. $thumb = imagecreatetruecolor($newwidth, $newheight);
   $source = imagecreatefromjpeg($filename);

   to :

$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);
&& $source = imagecreatefromgif($filename);
&& $source = imagecreatefrompng($filename);
etc[/code]

or something like :

$thumb = imagecreatetruecolor($newwidth, $newheight);
if ( $filetype == "png") {
$source = imagecreatefrompng($filename);
} else if ( $filetype == "jpg") {
$source = imagecreatefromjpeg($filename);
} else ( $filetype == "gif") {
$source = imagecreatefromgif($filename);
};

But i'm obviously barking up the wrong tree, as I can't seem to get it to work.

Can anyone advise me of how the syntax for this would work?

[konrad]

Check getimagesize() function - it returns width, height, type and mime type of the image. Try to modify your script :

<?php
// Max Sizes
$th_max_width = 120;  // Maximum width of the thumbnail
$th_max_height = 120; // Maximum height of the thumbnail

//-------------------

// File
$filename = $_GET['file'];

// Get image sizes, type & mime
$img_data = getimagesize($filename);
$width = $img_data[0];
$height = $img_data[1];
$img_type = $img_data[2]; // Numeric value (check in manual)
$mime = $img_data['mime'];

// Content type
header('Content-type: ' . $mime);


// Resize
$ratio = ($width > $height) ? $th_max_width/$width : $th_max_height/ 
$height;
$newwidth = round($width * $ratio);
$newheight = round($height * $ratio);

// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);

switch ($img_type){
 case 1:
  $source = imagecreatefromgif($filename);
  break;

 case 2:
  $source = imagecreatefromjpeg($filename);
  break;

 case 3:
  $source = imagecreatefrompng($filename);
  break;
 //  Other file types...
}

//Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight,  

$width, $height);

// Output
imagejpeg($thumb);
?>

<?php
exit;
?>

hope this helps...

[turtleton09]

Cheers - that does indeed help.

Just as I think I'm getting familair with the if...then... syntax along comes this case 1, case 2, case 3 thing! 🙂

Looking at the getimagesize function, it looks as tho' the file types supports is a bit limiting - we might have liked to include TIFs and photoshop files too.

[turtleton09]

got it!

<?php 
// Max Sizes 
$th_max_width = 120;  // Maximum width of the thumbnail 
$th_max_height = 120; // Maximum height of the thumbnail 

//------------------- 

// File 
$filename = $_GET['file']; 

// Get image sizes, type & mime 
$img_data = getimagesize($filename); 
$width = $img_data[0]; 
$height = $img_data[1]; 
$img_type = $img_data[2]; // Numeric value (check in manual) 
$mime = $img_data['mime']; 

// Content type 
header('Content-type: ' . $mime); 


// Resize 
$ratio = ($width > $height) ? $th_max_width/$width : $th_max_height/ 
$height; 
$newwidth = round($width * $ratio); 
$newheight = round($height * $ratio); 

// Load 
$thumb = imagecreatetruecolor($newwidth, $newheight); 

switch ($img_type){ 
case 1: 
  $source = imagecreatefromgif($filename); 
  break; 

case 2: 
  $source = imagecreatefromjpeg($filename); 
  break; 

case 3: 
  $source = imagecreatefrompng($filename); 
  break; 

case 4: 
  $source = imagecreatefromwbmp($filename); 
  break;

//  Other file types... 
} 

//Resize 
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight,   

$width, $height); 

// Output 
imagejpeg($thumb); 
?> 

<?php 
exit; 
?> 

looking at the getimagesize function it looks as tho' it's a bit limited with file type support - TIF and photoshop would have been handy.