Description:
------------
victor:~> php -v
PHP 5.0.0RC2 (cgi) (built: Apr 30 2004 08:15:25)

(oh well, this issue still exists in 5.0.0)

victor:~> grep output /usr/local/lib/php.ini
<snip>
output_buffering = 4096
<snip>
output_handler =
<snip>
zlib.output_compression = Off

victor:~> ls -l test.fil 
-rw-r--r--  1 root  wheel  734939136 Oct 14  2003 test.fil

--------------------------------

As the results shows, PHP tries to allocate the whole file in memory which is bad. I thought php_stream_passthru used a small buffer and that it didn't allocate the whole file, but I'm not familiar with the PHP source code. 


Reproduce code:
---------------
<?php
  readfile("test.fil");
?>


Expected result:
----------------
A lot of file data in the browser window (the file contents)

Actual result:
--------------
PHP Fatal error:  Out of memory: cannot allocate 734941208 bytes! in /usr/home/victor/foo.php on line 2
Content-type: text/html
X-Powered-By: PHP/5.0.0RC2

<br />
<b>Fatal error</b>:  Out of memory: cannot allocate 734941208 bytes! in <b>/usr/home/victor/foo.php</b> on line <b>2</b><br />