Hanging Function on Mac

Shawazi

I have an admin area that uploads files. It works perfect on a PC but sometimes hangs on a Mac. It takes about 5 minutes to process the script on the mac when trying to upload a 50kb file - or it just hangs up the site all together.

$img_res = my_query("SELECT * FROM $main_table WHERE Bh_id=\"$the_id\"");
$img = mysql_fetch_array($img_res);
@unlink($base_dir."images/article_images/widescreens/$img[Bh_image_loc]");
//makes it here fine
copy_file($widepic, $base_dir."images/article_images/widescreens/", $wide, 350);

copy_file is this:

function copy_file($mainpic, $directory, $main, $maxwidth)
{
	$destination = $directory.$main;
	die("$destination");
	// copy image	
	copy($mainpic, $destination);
	//edited out more code that doesn't apply
}

I don't understand how it could hang up before the function even tries to copy anything. I used the die to see if the script would make it that far, but it didn't. Any ideas?

MarkR

Is this a client or server problem? Do you mean the server is a Mac, or the client is a Mac.

If it's a Mac client causing the problem, can you upload to other sites successfully with this client? Have you tried the simplest possible script which accepts uploads?

Mark

Shawazi

The client is a Mac. I run the script on my PC in the same room and it works fine every single time. On the Mac it decides to hang at will. By hang I mean it either takes 5 minutes to do something, or it somehow uses so many resources they need to close Firefox/Safari to use it to browse again. If they wait too long to close the browser it makes my server unavailable for a few minutes, simliar to if you left a neverending loop going. But there is not one loop in the script.

With the die in place where it is, the script simply calls the function, and then dies saying the path it should be going to. This is before any copy attempt is even made. The form is the usual enctype="multipart/form-data". On the times it doesn't hang, things upload fine, or with the die in place, it will show the correct path and file name.

Shawazi

Any ideas at all? This seems completely illogical.

Shawazi

Sometimes the server gives me this message on a PC:
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 2384 bytes) in .. on line 92

Line 92:

$target_id = imagecreatetruecolor($dest_x, $dest_y);

Although, on the mac, it will hang before that line is ever accessed. Is this a different problem? I'm probably calling up my server today.

MarkR

My guess is that an error in your HTML is causing $dest_x and/or $dest_y to become very large at runtime, and you have no adequate checking in for these values.

The server then tries to allocate more memory than it has, and that causes the issues.

Mark

Shawazi

They are apparently two separate issues (fixed the RAM one). I went through the code line by line, putting prints and exits along the way to see how far the script got without causing a crash. Here is the line it hangs on, on a Mac only.

header("Location: the_file.php?the_id=$the_id");

I commented out that line and it works perfect. It used to be Location: $PHP_SELF, but I changed it to specifically say the file, just in case. This exact line is used throughout the site. I tried to update the info on the form, WITHOUT uploading a file, and it still crashed.

Edited: It does not crash on other pages that use the same functions to edit photos and use a header.

Shawazi

header("Location: $_SERVER[PHP_SELF]?update=yes&the_id=$the_id") or die("Unable to redirect");

Adding the order die made it work fine. Removing the die made it hang. Answers? Weirdest problem I've ever had. You'd think if it hangs without the die, it would die once that statement is put in.

MarkR

You definitely need to enable error_reporting(E_ALL), log errors and tell us any errors which are happening.

It's possible that you've created a redirect loop, in which case you should be able to see that clearly on your web server access log.

Mark

Shawazi

Where do I enable that error reporting? Just put it on top of the file? Isn't it impossible for it to be a redirect loop? Once I put the "or die" it works and never shows the die message and it doesn't hang on a loop. It is also the last line of the if-block so I know it's not hitting any redirects anywhere else.