Question

PHP image resize that makes the resulting image download to user's computer and redirects to new page.

Asked by: Chiselneck

How can I made this code used to resize an image to 40 pixels wide... make the resulting image download to the user's computer, so they can save it to their hard drive and not on our server?

Also is there a method to have the user redirected to another page once the file has been converted?
Thanks.

Here's the code for the HTML page:

=====================================
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Resize to 40 pixels wide</title>
<style type="text/css">

</style>
</head>

<body>
<span class="style1"><span class="style3">Resize your images to 40 Pixels wide.</span><br />
Click browse below, locate the image you wish to resize and click Submit.<br />
<br />
</span>
<form action="upload.php" method="post" enctype="multipart/form-data" class="style1" >
<input type="file" name="uploadfile"/>
<input type="submit"/>
</form>
</body>
</html>
=================================

<?php
 
// This is the temporary file created by PHP 
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
 
// Create an Image from it so we can do the resize
$src = imagecreatefromjpeg($uploadedfile);
 
// Capture the original size of the uploaded image
list($width,$height)=getimagesize($uploadedfile);
 
// For our purposes, I have resized the image to be
// 600 pixels wide, and maintain the original aspect 
// ratio. This prevents the image from being "stretched"
// or "squashed". If you prefer some max width other than
// 600, simply change the $newwidth variable
$newwidth=40;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
 
// this line actually does the image resizing, copying from the original
// image into the $tmp image
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
 
// now write the resized image to disk. I have assumed that you want the
// resized, uploaded image file to reside in the ./images subdirectory.
$filename = "resized/". $_FILES['uploadfile']['name'];
imagejpeg($tmp,$filename,100);
 
imagedestroy($src);
imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request
// has completed.
?>

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:

Select all Open in new window

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

Plus...

30 Day FREE access, no risk, no obligation
Collaborate with the world's top tech experts
Unlimited access to our exclusive solution database
Never be left without tech help again

Subscribe Now

Asked On: 2009-03-27 at 23:11:14ID24273326
Tags: php
,; image
,; resize
,; html
Topics: PHP Scripting Language
,; Miscellaneous Web Development
,; PHP and Databases
Participating Experts: 2
Points: 125
Comments: 6

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

"The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
"Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
"Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Free Tech Articles

WARNING: 5 Reasons why you should NEVER fix a computer for free.
It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
SCCM OSD Basic troubleshooting
SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
Create a Win7 Gadget
This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
Outlook continually prompting for username and password
There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
Backup Exchange 2010 Information Store using Windows Backup
There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

Avoiding Bugs in Microsoft Access
Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
Top 10 Best New Features in Visio 2010
Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
IT Consultant Business Secrets Revealed
Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
Disaster Recovery and Business Continuity
Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
Organize Your Visio Diagrams with Containers and Lists
Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
How to Us Objects, Properties, Events and Methods in Microsoft Access
Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Watch More

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

by: marchentPosted on 2009-03-28 at 00:11:01ID: 24007526

http://icfun.blogspot.com/2009/03/php-resizing-image-using-php-gd.html

by: MasonWolfPosted on 2009-03-28 at 07:49:31ID: 24008718

The call to imagejpeg, if it doesn't include a filename parameter, will simply output the content of the image in binary to the client. If you tell the client to expect an image as a file attachment, it'll trigger the download you want.

As far as redirecting the browser, I think what you actually need to do is redirect the client before you present the download. Once you give them the download, your php control has pretty much ended.

<?php
 
// This is the temporary file created by PHP 
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
 
// Create an Image from it so we can do the resize
$src = imagecreatefromjpeg($uploadedfile);
 
// Capture the original size of the uploaded image
list($width,$height)=getimagesize($uploadedfile);
 
$newwidth=40;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
 
// this line actually does the image resizing, copying from the original
// image into the $tmp image
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
 
// now instruct the browser that it's about to receive an image for download
$filename = 'resized-' . ereg_replace('[^[:alnum:]]', '', $_FILES['uploadfile']['name']);
header('Content-Type: image/jpeg');
header('Content-Disposition: attachment; filename=' . $filename);
ob_start();
imagejpeg($tmp);
$content = ob_get_clean();
header('Content-Length:' . strlen($content));
echo $content;
imagedestroy($src);
imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request
// has completed.

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:

Select all Open in new window

by: ChiselneckPosted on 2009-03-28 at 11:44:18ID: 24009601

Nice that worked perfectly with the addition of one thing...

In the line: $filename = 'resized-' . ereg_replace('[^[:alnum:]]', '', $_FILES['uploadfile']['name']);
I added a . in between '.' so that the line appears as seen below.
$filename = 'resized-' . ereg_replace('[^[:alnum:]]', '.', $_FILES['uploadfile']['name']);

I did this because the resulting image for download appeared as resized-imagejpg. With the addition of the '.' I was able to get it to make the resulting file name appear as resized-image.jpg

<?php
 
// This is the temporary file created by PHP 
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
 
// Create an Image from it so we can do the resize
$src = imagecreatefromjpeg($uploadedfile);
 
// Capture the original size of the uploaded image
list($width,$height)=getimagesize($uploadedfile);
 
$newwidth=40;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
 
// this line actually does the image resizing, copying from the original
// image into the $tmp image
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
 
// now instruct the browser that it's about to receive an image for download
$filename = 'resized-' . ereg_replace('[^[:alnum:]]', '.', $_FILES['uploadfile']['name']);
header('Content-Type: image/jpeg');
header('Content-Disposition: attachment; filename=' . $filename);
ob_start();
imagejpeg($tmp);
$content = ob_get_clean();
header('Content-Length:' . strlen($content));
echo $content;
imagedestroy($src);
imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request
// has completed.

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:

Select all Open in new window

by: ChiselneckPosted on 2009-03-28 at 11:53:12ID: 31563815

I added a period in the line of the code mentioned below to make the resulting image come out as (resized-image.jpg). I posted the code of my tiny addition to your solution. Thanks this was very helpful.

$filename = 'resized-' . ereg_replace('[^[:alnum:]]', '.', $_FILES['uploadfile']['name']);

by: MasonWolfPosted on 2009-03-28 at 12:38:13ID: 24009812

Actually, I only needed to make sure that the filename had spaces stripped out in order to avoid breaking the header. I forgot that the '.' would also be lost. Here's a better ereg_replace line:

$filename = 'resized-' . ereg_replace('\s', '', $_FILES['uploadfile']['name']);

by: MasonWolfPosted on 2009-03-28 at 12:42:48ID: 24009828

By the way - you should be more suspicious of uploaded files. I added a check that exits the script if the filetype isn't a jpeg image, or if someone tried to trick the system into looking at a file that wasn't actually uploaded by the user.

It's just good security practice.

<?php
//exit if it isn't a jpeg, or if the file wasn't uploaded
if($_FILES['uploadfile']['type'] != 'image/jpeg' || !is_uploaded_file($_FILES['uploadfile']['tmp_name']) {
   die('that is not a valid file');
}
// This is the temporary file created by PHP 
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
 
// Create an Image from it so we can do the resize
$src = imagecreatefromjpeg($uploadedfile);
 
// Capture the original size of the uploaded image
list($width,$height)=getimagesize($uploadedfile);
 
$newwidth=40;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
 
// this line actually does the image resizing, copying from the original
// image into the $tmp image
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
 
// now instruct the browser that it's about to receive an image for download
$filename = 'resized-' . ereg_replace('\s', '', $_FILES['uploadfile']['name']);
header('Content-Type: image/jpeg');
header('Content-Disposition: attachment; filename=' . $filename);
ob_start();
imagejpeg($tmp);
$content = ob_get_clean();
header('Content-Length:' . strlen($content));
echo $content;
imagedestroy($src);
imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request
// has completed.

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:

Select all Open in new window

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

For individual users
Instant access to solutions
Ask your tech questions
Start your 30-day Free Trial

Business Accounts

Perfect for organizations
Multiple users
Save over 36%
Create a Business Account

Answer for Membership

Earn free access
Showcase your knowledge
No credit card required
Sign Up to Answer

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...

Question

PHP image resize that makes the resulting image download to user's computer and redirects to new page.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

php

image

resize

html

PHP Scripting Language

Miscellaneous Web Development

PHP and Databases

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Need individual assistance?

Our experts are ready to help.

Want to learn from the best?

Read articles from industry experts.

Working on a long term project?

Store your work and research.

What Makes Experts Exchange Unique?

Trusted by the world's most respected brands.

Faithfully serving IT professionals since 1996.

Related Solutions

Free Tech Articles

Cloud Class Webinars

Join the Community

Give a Little. Get a Lot.

Answers

3 Ways to Join

The Experts

The Experts

Testimonials

Testimonials

Testimonials

Business Clients

Business Clients

In the Press

In the Press

In the Press