PHP Image Resize

[richo89]

Hey,

 

I've got a script that uploads an image to a particular destination that the user has selected however I wondered if its simple enough to resize that image and upload it to a seperate destination?

 

My code:

 

//define a maxim size for the uploaded images in Kb
define ("MAX_SIZE","500"); 

//This function reads the extension of the file. It is used to determine if the file  is an image by checking the extension.
function getExtension($str) {
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
}

//This variable is used as a flag. The value is initialized with 0 (meaning no error  found)  
//and it will be changed to 1 if an errro occures.  
//If the error occures the file will not be uploaded.
$errors=0;
	//reads the name of the file the user submitted for uploading
	$image=$_FILES['image']['name'];

	//if it is not empty
	if ($image) 
	{
	//get the original name of the file from the clients machine
		$filename = stripslashes($_FILES['image']['name']);
	//get the extension of the file in a lower case format
  		$extension = getExtension($filename);
		$extension = strtolower($extension);
	//if it is not a known extension, we will suppose it is an error and will not  upload the file,  
//otherwise we will do more tests
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) 
		{
	//print error message
			echo '<h1>Unknown extension!</h1>';
			$errors=1;
		}
		else
		{
//get the size of the image in bytes
//$_FILES['image']['tmp_name'] is the temporary filename of the file
//in which the uploaded file was stored on the server
$size=filesize($_FILES['image']['tmp_name']);

//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
{
echo '<h1>You have exceeded the size limit!</h1>';
$errors=1;
}

//we will give an unique name, for example the time in unix time format
$image_name=time().'.'.$extension;
//the new name will be containing the full path where will be stored (images folder)
$newname="images/".$image_name;

//IMAGE RESIZER *********************

//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES['image']['tmp_name'], $newname);
if (!$copied) 
{
echo '<h1>Copy unsuccessfull!</h1>';
$errors=1;
}}}

 

Now I was wondering if its possible to take the file its uploaded or even resize the image before its uploaded and place it in imagesResized folder?

 

Thank you.

[yoda69]

What about GD and image functions? Did you think about using those?

 

http://php.net/manual/en/book.image.php

[richo89]

What about GD and image functions? Did you think about using those?

 

http://php.net/manual/en/book.image.php

 

Ok such as the imagecopyresized ?

 

I'll give that a look, I just want a simple resize of the image the user has selected and then upload it.

 

Thanks

[JonnoTheDev]

Do you have imagemagick on your server? It is 100 times better than using php libraries to manipulate images. just send the commands to the system i.e

<?php
// resize my uploaded image
exec("convert -geometry 150x150 -quality 100 /myfolder/myimage.jpg /myfolder/thumbnails/myimage.jpg");
?>

A lot of shared hosting companies do allow the use of it.

[richo89]

No I dont have imagemagick unfortunately I can certainly look into it however.

 

I was hoping with my image upload above I could simply use a PHP function to just resize the image but it's obviously not as simple as that.

[JonnoTheDev]

I was hoping with my image upload above I could simply use a PHP function to just resize the image but it's obviously not as simple as that.

You can using the GD library of funtions as mentioned above. Check out the examples on the php manual.

http://uk.php.net/manual/en/ref.image.php

I would still always prefer to use Imagemagick though.

[litebearer]

Here is one I use for resizing...

 

http://www.nstoia.com/toh/imageresize.php