[2005-04-24 16:04 UTC] matteo at beccati dot com

Description:
------------
In recent PHP versions, fread only reads 8192 bytes from a file generated with tmpfile().

I've already seen bug reports #29023 and #30936 which seem strongly related to this issue. From what I can see, fread on local files isn't limited to the PHP chunk size of 8192, while a fread on a tmpfile acts like it was i.e. a network stream, breaking backwards compatibility. I found out this issue investigating a recently reported bug for phpAdsNew, which uses this function to deal with remote ftp-stored files.

IMVHO this can be considered a bug in in the tmpfile() implementation. If you don't agree, well... I suggest to mark it as a documentation bug, because I couldn't find nothing related to the 8192 bytes limit in the manual.


Versions/OS tested and affected:
PHP 4.3.10 Linux
PHP 4.3.11 FreeBSD and Windows
PHP 5.0.4  Windows

Versions/OS tested and unaffected:
PHP 4.3.4  Windows


Reproduce code:
---------------
<?php

$fp = tmpfile();  

// This would give the correct result
// $fp = fopen('/tmp/test.dat', 'w+');

fwrite($fp, str_repeat('0', 100000));

$size = ftell($fp);
rewind($fp);
$buf = fread($fp, $size);

echo "Bytes written: ".$size."\n";
echo "Bytes read:    ".strlen($buf)."\n";

fclose($fp);

?>

Expected result:
----------------
Bytes written: 100000
Bytes read:    100000


Actual result:
--------------
Bytes written: 100000
Bytes read:    8192