Image resize

[dfowler]

Hey guys, I've created the following upload script to allow an admin to upload images and associate with items in a database.  The problem is, I would like to be able to resize the images for a thumbnail size, but I'm not sure how to do this.  Eventually on the front-end the page will pull 'featured' items from the database and display them next to the thumbnail associated with them.  Here is what I have so far:

 

<?php
include 'system.php';

   $query2 = "select * from items where active='1' and featured='1'";
   $resource = mysql_query($query2);
   while (($row = mysql_fetch_assoc($resource)) !== false) {
        $items[] = $row;
   }
?>
<form enctype="multipart/form-data" action="uploader.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
Choose a file to upload: <input name="uploadedfile" type="file" /><br />
Featured Item: <select name="item_name">
<?php foreach($items as $i){
	echo "<option value='".$i['id']."'>".$i['name']."</option>";
} ?>
</select>
<input type="submit" value="Upload File" />
</form>

 

<?php
include 'system.php';

$path = "images/";

$target_path = $path . basename($_FILES['uploadedfile']['name']);

if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
echo "The file ". basename($_FILES['uploadedfile']['name']). " has been uploaded";
$sql = "INSERT INTO images (name, location, item_id) VALUES ('". $_FILES['uploadedfile']['name'] ."', '". $target_path ."', '". $_POST['item_name'] ."')";
mysql_query($sql) or die (mysql_error());
} else {
echo "There was an error uploading the file (". basename($_FILES['uploadedfile']['name']). "), please try again!";
}
?>

[corbin]

Read the following links...  If you have any questions, I'll be happy to answer them ;p.

 

http://php.net/gd

http://php.net/imagecreatefromjpeg

http://php.net/imagecreatefrompng

http://php.net/imagecreatetruecolor

http://php.net/imagecopyresampled

http://php.net/imagesx

http://php.net/imagesy

[dfowler]

It looks like I will have to throw a couple of if statements to check and see what type of image file they upload, then depending on what it is use one of these functions.  Am I correct?

[corbin]

Exactly ;p.

 

What you'll want to do....

 

(Psuedo code....  Too lazy to actually type it all out.  That's what you get to do ;p.)

 

<?php

//pretend $file holds the filepath to the input file...
//pretend $output is the output path

//get the file extension from $file
if(extension is jpg) {
     $in_img = imagecreatefromjpeg($file);
}
else if(extension is png) {
     $in_img = imagecreatefrompng($file);
}
else if(.....)

$out_img = imagecreatetruecolor(new_width, new_height);

imagecopyresampled($out_img, $in_img, <other params>);

//then, what ever file type you want to save it as, you use the corrosponding image<type>() function

imagepng($out_img, $output);

?>

 

Edit: Oh, you'll probably wanna do some math to keep the porportions, although, if you want thumbs of the same size, you might have to distort it a little.

[dfowler]

Will I have to upload the original image first?  Or can I use this to only place the thumbnail on the server?

[craygo]

read up on this

 

http://www.phpfreaks.com/forums/index.php/topic,191541.0.html

 

No you won't have to save the original image. You can use the second parameter in imagejpeg, imagepng or the others to save the generated image.

 

Ray

[dfowler]

Looks like back to the drawing board, my upload script isn't even working.  Can anybody see what is wrong with it?  It is an older script that I've used before, but on a different server.  Are there any settings that will affect this?

[dfowler]

Ok, I fixed the uploading issue, just had to modify some of the server settings.  Now back to trying to get the resize to work.