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Bug #17635 User-defined output handler can't find files without ob_end_flush()
Submitted: 2002-06-07 00:17 UTC Modified: 2002-10-08 12:07 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: mogul-php at gelatinous dot com Assigned:
Status: Closed Package: Output Control
PHP Version: 4.2.1 (plus CVS for 4.3) OS: RH Linux 7.3 w/all updates
Private report: No CVE-ID: None
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From: mogul-php at gelatinous dot com
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 [2002-06-07 00:17 UTC] mogul-php at gelatinous dot com 
I wrote a custom output handler and registered it with ob_start(). The handler gets called if I call ob_end_flush() or when the script ends, as expected.

If the handler tries to open a file that's in the same directory as the script, I get different behavior depending on whether ob_end_flush() was called or the script just ended.  Here's code demonstrating the bug (replace 'fileinthisdir' with an actual file's name):

<?php
$explicit_ob_flush=false;
function my_output_handler($string) {
	return (fopen('fileinthisdir', 'r') ? "Opened file!" : "Couldn't open file!");
}
ob_start("my_output_handler");
?>
Hi, this is some text.
<?
if($explicit_ob_flush) {
	ob_end_flush();
}
?>

This script won't find the file as is.  Change $explicit_ob_flush to true, though, and it will.  (Note that supplying a full pathname to the file works... This is a problem with relative paths, not absolute paths.)


[I'm running RH 7.3 with all updates applied.  My php is version 4.2.1 from the RH RawHide RPMs, recompiled to add --enable-xslt and --with-xslt-sablot but otherwise unmodified.  The sablotron version is 0.90.]

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 [2002-06-07 00:28 UTC] yohgaki@php.net 
Cannot reproduce with PHP 4.3.0(CLI).
Could you try PHP 4.3.0-dev and report the result?
 [2002-06-07 12:03 UTC] mogul-php at gelatinous dot com 
Happy to try... How do I acquire 4.3.0-dev?  Is this a tarball? CVS branch? Or is this just shorthand for the HEAD branch in CVS?
 [2002-06-07 12:13 UTC] derick@php.net 
You can either use a snapshot from snaps.php.net (the non-STABLE tarball) or get it from CVS (HEAD).

Derick
 [2002-06-07 12:55 UTC] mogul-php at gelatinous dot com 
Still building 4.3.0-dev... Meanwhile, I tried it via the CLI with 4.2.1 and this behavior is not exhibited!  So it only appears when called as a module from apache...

[apache version is 1.3.23.]
 [2002-06-20 14:42 UTC] sander@php.net 
Status on this?
 [2002-06-20 20:08 UTC] mogul-php at gelatinous dot com 
Just confirmed this with the php4-200206191200 snapshot.  The behavior is not exhibited under the CLI, but happens reliably via Apache.
 [2002-06-28 17:05 UTC] mogul-php at gelatinous dot com 
Curious: Is anyone looking at this?  My project is on the back burner until there's a fix.  

I'll be happy to investigate myself given suggestions where to look in the code, but so far I'm having trouble finding where a script's execution starts and ends... It's obvious for the CLI version, but the Apache module is a different story...  Any pointers?
 [2002-10-08 12:07 UTC] iliaa@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
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