PHP Forum

**dansgalaxy** · 03-30-2008, 06:34 PM

Hello,

How would i go about having a a script which resizes a image so its under 80 X 80 i want this for resizing images which have been uploaded for Avatars.

How can i do this and where can i get a script

Thanksm
Dan

**murfituk** · 03-30-2008, 08:36 PM

Here's a script I use which you are welcome to try. I adapted it from somewhere else. It uploads a file then creates a thumbnail called tb_filename. Stores both images in a folder you specify.

uploadimage.html

Code:

<html>
<head>
<title>Upload and Resize</title>
</head>
<body>
<form method="POST" enctype="multipart/form-data" action="upload.php">
<input type="file" name="userfile" />
<input type="submit" value="Upload Image" />
</form>
</body>
</html>

upload.php

Code:

<?php

// Get details of uploaded file
$filetmp = $_FILES['userfile']['tmp_name'];
$filename = $_FILES['userfile']['name'];
$length=strlen($filename);

// Limit filename to 40 chars
if ($length>40)
{
print "<p>The file ($filename) cannot be used.  Try again with a shorter filename.</p>\n";
exit;
}

// Directory where uploaded images and thumbnails will be stored
$path = "images/";
$path_chunks = explode("/", $filename);
$thefile = $path_chunks[count($path_chunks) - 1];
$dotpos = strrpos($thefile, ".");
$extension = substr($thefile, $dotpos + 1);

// If no file was uploaded, redirect back to upload page
if (!$filename)
{
header("Location: uploadimage.html");
exit;
}

// Error message if not jpg or JPG
$permitted = array("jpg", "JPG", "jpeg", "JPEG");
if (!in_array($extension, $permitted))
{
print "<p>The file ($filename) cannot be used.  Try again with a jpg/JPG/jpeg/JPEG.</p>\n";
exit;
}

// Save the uploaded file to the directory
$newfile = $path . $filename;
move_uploaded_file($filetmp, $newfile);

// Specify filename for the thumbnail (tb_filename)
$saveto = $path . "tb_" . $filename;

// Get dimensions
list($width, $height) = getimagesize($newfile);

// This resizes a thumbnail to 150px wide (can also do $height/150 to get 150px tall)
$scale = $width / 150;
$new_width = $width / $scale;
$new_height = $height / $scale;

// Create the thumbnail
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($newfile);

// Save the thumbnail
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagejpeg($image_p, "{$saveto}", 100);

// All done - redirect to upload page for next one
header("Location: uploadimage.html");
?>

It only lets you specify a maximum height or width (not both) so if you want 80x80 you may have to fiddle with it. Don't have time to do it now but you could probably work it our yourself.

Make sure you have created a directory to store the images, and that your script has permission to write to it.

**mtishetsky** · 03-31-2008, 12:48 AM

This question appears here once every two weeks. And every time somebody advises to resize images with ImageCopyResampled() which requries a lot of work and later the script start failing with "out of memory" error, because some idiot uploads his 7Mpx photo to make a 80x80 avatar. Use command-line ImageMagick utility called "convert" instead:

PHP Code:


			
exec("convert {$infile} -scale '80x80>' {$outfile}");

Advantages:
- no need to find out the format (jpg, gif, png or whatever) of the input file
- no need to manually set the format of the output file (both are set by utility according to file extension)
- no need to calculate ratio and dimensions of the output file
- no limit on the input file filesize and resolution
- works ten times faster than the script
Disadvantages:
- can only be run through exec() or similar functions which most web developers are afraid of for some unknown reason.

**dansgalaxy** · 03-31-2008, 07:53 AM

I wil definatly have to try that mtishetsky looks like exactly what i want.

Thanks,
Dan