Description:
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hi,
using a mysql db, and jpeg images strings in BLOB fields. All the images are readable on a computer through any image editor. But imagecreatefromstring() doesn't recognize some of them as valid jpeg strings, (it returns the classic error message "not a valid image string") and I couldn't be able to find the commom criteria of these images.
The script is located on a server I do not own, and the admin says it's my script's fault. Some images work, and some not.
The problem appeared since they went up to GD2.
I'm only a PHP *USER*, so I do not use, and do not understand the compiling options, but I use the bundled gd2 library by uncommenting the line: "extension=php_gd2.dll". I test my scripts on a WinXP machine with Apache 2.0.45, and it perfectly works. I figured that, even if both my ISP and I are using GD2, it doesn't display the same way in phpinfo(): mine appears "bundled", and the ISP's doesn't.

So I think the imagecreatefromstring() function doesn't accept some strings any more, which the previous version did on my ISP' servers.

I hope that all the infos I provided will help you to solve the problem, which I'm sure doesn't come from me.


Reproduce code:
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I just call a <img src="script.php?id=[the id of the image in my database]">


The script "script.php": (which normally contains the database connection infos, and the connection opening function)

$sql="SELECT * FROM image_db WHERE id='$img_id'";
$resultat=mysql_query($sql);

$quality=100;

$ligne=mysql_fetch_array($resultat);
$data=$ligne["data"];
$im=imagecreatefromstring($data);
$im=imagejpeg($im,"",$quality);
imageinterlace($im,$interlace);
imagedestroy($im);


Expected result:
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I whish it simply displayed *all* the images. It does for some, and doesn't for some others wich are -I think I repeat myself- perfectly readable otherwise.

Actual result:
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Well, in fact it doesn't, and also displays an HTTP 500 Internal Server Error.
I could get the error message only thanks to the admin, who tracked the error for me in a file.