Description:
------------
We were using eval extensivly for making a dynamic code parser. It used to be all ok till we needed to use it for more than 30000 iterations. Suddenly our memory limit was reached. We tracked it down to the underlying code.

Strangely this is only an issue with 64 Bit systems. A PowerMac Dual has this Problem the same as a 8 Core XEON. The INTEL and AMD with 32 bits don't have a Problem, here the script requires no additional memory with each cycle.

Probably this has to do with some underlying library, but maybe you can figure out which.

Here is a part of my php info

Linux ******** 2.6.23.17-88.fc7 #1 SMP Thu May 15 00:02:29 EDT 2008 x86_64
Build Date 	May 8 2008 08:38:49
Configure Command 	'./configure' '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/usr/com' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--cache-file=../config.cache' '--with-libdir=lib64' '--with-config-file-path=/etc' '--with-config-file-scan-dir=/etc/php.d' '--disable-debug' '--with-pic' '--disable-rpath' '--without-pear' '--with-bz2' '--with-curl' '--with-exec-dir=/usr/bin' '--with-freetype-dir=/usr' '--with-png-dir=/usr' '--enable-gd-native-ttf' '--without-gdbm' '--with-gettext' '--with-gmp' '--with-iconv' '--with-jpeg-dir=/usr' '--with-openssl' '--with-png' '--with-pspell' '--with-expat-dir=/usr' '--with-pcre-regex=/usr' '--with-zlib' '--with-layout=GNU' '--enable-exif' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets' '--enable-sysvsem' '--enable-sysvshm' '--enable-sysvmsg' '--enable-track-vars' '--enable-trans-sid' '--enable-yp' '--enable-wddx' '--with-kerberos' '--enable-ucd-snmp-hack' '--with-unixODBC=shared,/usr' '--enable-memory-limit' '--enable-shmop' '--enable-calendar' '--enable-dbx' '--enable-dio' '--without-mime-magic' '--without-sqlite' '--with-libxml-dir=/usr' '--with-xml' '--with-system-tzdata' '--with-apxs2=/usr/sbin/apxs' '--without-mysql' '--without-gd' '--without-odbc' '--disable-dom' '--disable-dba' '--without-unixODBC' '--disable-pdo' '--disable-xmlreader' '--disable-xmlwriter' '--disable-json'


I checked the other eval errors, but they did not have much to do with mine, and they are all stone old ;).

Reproduce code:
---------------
echo "start ".memory_get_usage()."\n";

$aData['an_anfrage_art'] = '150';

$aData['ega_codes'] = '12|13|15|17|18|23';

for ($i=0;$i<100000;$i++){

   eval('$bCondition = !in_array( \'150\' , array(12,13,15,17,18,23));');

}

echo "end ".memory_get_usage();

Expected result:
----------------
start 46592 
end 47980

32 bit system. This is the expected result the memory usage is constant with more cycles

Actual result:
--------------
start 78488
end 1710444

64 bit system. Here the memory usage is growing linearly. More cycles make the memory consumption grow.