Edit report at https://bugs.php.net/bug.php?id=41245&edit=1
ID: 41245
Updated by: rasmus@php.net
Reported by: bens at effortlessis dot com
Summary: Ability to set handler for "memory limit exceeded"
Status: Open
Type: Feature/Change Request
Package: *General Issues
Operating System: Any
PHP Version: 4.4.6
Block user comment: N
Private report: N
New Comment:
Oh, and why wouldn't you just use a shutdown function for this? If you do all
your processing before sending any output and then check for an out of memory in
the shutdown function you can easily do this redirect in this case.
Previous Comments:
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[2012-09-04 20:18:22] rasmus@php.net
That is rather tricky because such a callback could continue consuming memory. We
would have to introduce the concept of soft and hard limits or something along
those lines for this to be realistic.
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[2012-09-04 19:58:07] slusarz at curecanti dot org
This would be tremendously useful, especially when the cause of the memory overrun is not the PHP
code but rather due to the data input to the script.
For example: In Horde/IMP, we need to parse MIME e-mail messages. These e-mail messages contain
data that potentially could be unfiltered. A particular mail message script MUST parse the entire
data input in order to show anything (you cannot truncate MIME data, or else the resulting MIME
message is invalid). Even using things like temporary data streams, there is still a chance that
the memory limit can be exceeded.
It would be tremendously useful to be able to define a memory limit exceeded handler for any given
script that could catch the case where we can not parse the message due to a memory limit caused by
the message data itself. This handler could allow the script to do something like automatically
redirect the browser to a different page and display an error message.
------------------------------------------------------------------------
[2007-04-30 19:33:55] bens at effortlessis dot com
Description:
------------
When Memory Limit is exceeded, PHP simply terminates, which shows as a "blank white
screen".
It would be very helpful if a callback function or simply an optional header redirect could be
emitted when memory limit is exceeded. It could be as simple as an option in php.ini which would
work like the "ErrorDocument" apache directive, so that an attractive, "What you
asked for used up too much memory, so sorry!" page could be displayed rather than just an
uninformative and unfriendly blank screen.
This idea could perhaps be expanded to a default "PHP died" handler, so that a friendly
"something went wrong" page could be displayed.
Reproduce code:
---------------
$somevar='';
for ($i=0; $i<2000000000000; $i++)
$somevar.="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
Expected result:
----------------
Program output:
Location: /value/set/in/php.ini/or/apache/directive/helpful.html
Logfile output:
[client 63.195.17.22] PHP Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to
allocate 11870154 bytes) in /path/to/php/file.php on line 216, referer: http://mysite.com/path/to/php/file.php?PHPSESSID=2a39d521e3660f0a4fc2132dc34e1e68
Actual result:
--------------
Program output:
Logfile output:
[client 63.195.17.22] PHP Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to
allocate 11870154 bytes) in /path/to/php/file.php on line 216, referer: http://mysite.com/path/to/php/file.php?PHPSESSID=2a39d521e3660f0a4fc2132dc34e1e68
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=41245&edit=1