#45762 [NEW]: Strange eval() behaviour

From:             marcus dot mueller at grintsch dot com
Operating system: Linux gdev 2.6.25-2-amd64 #1 SMP
PHP version:      5.2.6
PHP Bug Type:     *General Issues
Bug description:  Strange eval() behaviour

Description:
------------
I'm not quite sure this is a bug, so if it isn't please excuse my
ignorance.

Running the script below on a produces a "PHP Parse error:  memory
exhausted".

Lowering 9994 to 9993 doesn't expose this behaviour and produces the
expected result (well, "boolean false" oc).

From the PHP manual: "PHP imposes no boundary on the size of a string; the
only limit is the available memory of the computer on which PHP is
running".

The box I'm running this on has 4GB.

Reproduce code:
---------------
<?php
for($foo='',$i=0;$i<9994;$i++) {
	$foo.='1+';
}
eval('$foo='.$foo.' 1;var_dump($foo);');

for($foo='',$i=0;$i<9994;$i++) {
	$foo.='!';
}
eval('$foo='.$foo.' 1;var_dump($foo);');
?>

Expected result:
----------------
int 9995

boolean true


Actual result:
--------------
int(9995)
Parse error: memory exhausted in not.php(10) : eval()'d code on line 1

-- 
Edit bug report at http://bugs.php.net/?id=45762&edit=1
-- 
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45762&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45762&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45762&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=45762&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=45762&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=45762&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=45762&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=45762&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=45762&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=45762&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=45762&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=45762&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=45762&r=globals
PHP 4 support discontinued:   http://bugs.php.net/fix.php?id=45762&r=php4
Daylight Savings:             http://bugs.php.net/fix.php?id=45762&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=45762&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=45762&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=45762&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=45762&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=45762&r=mysqlcfg