Thumbnailing from php

[Haz]

I am having some trouble creating thumbnails from php.
Using imagecreatefromjpeg(), which I understand uses the GD image library.
Is this included in this build of php.
Is there another way of creating thumbnails dynamically?

This functionality has worked with another host using Cpanel.

Any ideas?

[esnail]

create a file called test.php or something of your liking. In this file type

<?php phpinfo(); ?>

then upload it to your server and access it in a web browser. There you can check whether GD2 is enabled.

[Haz]

Yes, GD2 is installed.
Is there any other reason that imagecreatefromjpeg would not work?

[Haz]

The actual error is:
gd-jpeg, libjpeg: recoverable error: Premature end of JPEG file

I have managed to get some files to upload,
however, I have a whole load of jpegs created on a Mac that produce this error.
Any suggestions? other than batch convertion.
It would be nice if this app was solid.

[DavidAllen]

Here's the code I use to create thumbnails

function resizeImage($img, $imgPath, $quality,$medPath,$thumbPath) {
    // Open the original image.
    list($width, $height, $type, $attr) = getimagesize($imgPath.'/'.$img);
    //create new file name
    $baseName = explode("_",$img);
    $newNameE = explode(".", $img);
	
	// thumbnail
	$newName =  $baseName[0] . '.'. $newNameE[1] ;
	//check for existence
	if (!file_exists($thumbPath.$newName)) {
		if (!$original) {
			$original = createimage($imgPath.$img);
		}
	    // Determine new width and height for thumbnail image
	    if ($width>$height) {
	    	$newWidth=72;
	    	$newHeight=72*$height/$width;
	    } else {
			$newHeight=72;
			$newWidth=72*$width/$height;
		}

		// Resample the image.
		$tempImg = imagecreatetruecolor($newWidth, $newHeight);
		if (!$tempImg) {
			return false;
		} else {
		    if (!imagecopyresampled($tempImg, $original, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height)) {
		    	return false;
		    } else {
			    // Save the image.
			    if(!imagejpeg($tempImg, $thumbPath.$newName, $quality)) {
					return false;
				} else {
					//Clean up
				    imagedestroy($original);
				    imagedestroy($tempImg);
				}
			}
		}
	}
    return true;
}
function createimage($pathplusimg) {
    $foriginal = imagecreatefromjpeg($pathplusimg);
    if (!$foriginal) {
    	$foriginal=imagecreatefromgif($pathplusimg);
    }
    if (!$foriginal) {
    	$foriginal=imagecreatefrompng($pathplusimg);
    }
	return $foriginal;
}

key point is probably using

$tempImg = imagecreatetruecolor($newWidth, $newHeight);

to create a blank image of the new size and then using

imagecopyresampled($tempImg, $original, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height)

to resize and copy the image