Apache-php problem on fedora

jshannon · 12-07-2006, 03:45 AM

I cannot get apache on fedora 5 to display jpeg image from a simple script that runs fine on suse 10.1.

<?php
//picture-test.php
// get contents of a file into a string
$filename = "trafficamber.jpg";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);

header("Content-type: image/jpeg");

echo $contents;

?>

On Suse 10.1 this displays the image. On Fedora 5 the url is displayed. The image is less than 1k in size and I can display it from the fedora server by pointing my browser directly at it.

I have looked through the apache and php conf files but can't see anything obvious.

Help, What am I missing??

Thanks

johnewing · 12-08-2006, 10:02 AM

That is a wierd problem are you sure that apache has permission to read the file and that you have the filename correct?

Try something like this to check

<?php
//picture-test.php
// get contents of a file into a string
$filename = "trafficamber.jpg";

echo "<br>file exists:".file_exists($file_name);
$handle = fopen($filename, "r");
echo "<br>handle:$handle<br>";

$contents = fread($handle, filesize($filename));
fclose($handle);

// header("Content-type: image/jpeg");

echo $contents;

?>

If the file exists and handle is valid then it might be a configuration problem

J.

Boby · 12-08-2006, 02:25 PM

You have to make sure no output is made before the image headers are sent, not even one character or it will fail.
I'm not exactly sure when or why the "headers_sent" function is not working correct, but usually if you see the filename in the output something was wrong before the images was rendered in the browser.

Here is a simplified version of a script that I've used on an application, I don't advise you to use the "exit" messages, but instead maybe just trigger an error message and continue with the next step of the script.
The following example is just to make you an ideea on how to address this problem. It's checking a lot of things before the image is drawn, and it uses the GD + libJPEG libraries to display the image. I suggest this over you method.

PHP Code:


			
<?php
//Do not show warnings and notices
error_reporting (E_ALL ^ E_WARNING ^ E_NOTICE);

//Remove these 2 lines when going online
error_reporting (E_ALL); //Debug
ini_set ('display_errors', true); //Debug

$imageFilename = 'test.jpg';

//Check if GD library is loaded
if (!extension_loaded ('gd'))
{
   exit ('No GD library available!');
}

$gdInfo = gd_info();

//Check for JPEG support
if (!$gdInfo['JPG Support'])
{
   exit ('No JPEG library available! <code>libjpeg</code>');
}

//Check if headers were allready sent
//Doesn't make any sens to continue if they were sent
if (!headers_sent())
{
   //Check if file exists
   if (!file_exists ($imageFilename))
   {
      exit ('File does not exist!');
   }

   //Check if file is readable
   if (!is_readable ($imageFilename))
   {
      exit ('File is not readable, please change permissions!');
   }

   //Attempt to open image
   $image = @ imagecreatefromjpeg ($imageFilename);

   if (!$image)
   {
      //Could not load image
      exit ('Error loading image!');
   }

   //Send headers
   header ('Content-transfer-encoding: binary');
   header ('Content-Type: image/jpeg');

   //Draw image
   @ imagejpeg ($image);

   //Destroy image
   @ imagedestroy ($image);
}
else
{
   //Do not make any other output to the browser
   //before image is rendered
   die ('Headers were allready sent!');
}
?>

Make sure you remove these lines when going online with the script, they are ment to be there just for debugging:

PHP Code:


			
//Remove these 2 lines when going online
error_reporting (E_ALL); //Debug
ini_set ('display_errors', true); //Debug

Hope it helps!
Boby

jshannon · 12-11-2006, 04:57 AM

Thanks for the help.

As I said this was just a test script. The actual app has all the checking in place and is pulling image, pdf, mp3 and video files from a database.

The thing that did the job was the line..

header ('Content-transfer-encoding: binary');

As soon as I added this line it worked.

Jock