Description:
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compiling php 5.04 with the '-enable-zlib' option along with '--with-mysql' causes an 'Warning: mysql_query(): Unable to save result set' query to appear on older versions of PHP accessing the same database.

while preparing and testing an upgrade from the 4.3.9 version to the 5.0.4 version, i noticed that when i went back to my 4.3.9 version of the compiled code, i got 'Warning: mysql_query(): Unable to save result set'  for any SQL command after the 5.0.4 version did any database transactions.

i have 2 *seperate* machines with *identical* code accessing the same database.  Once the newer version is used, the older version does not work again.

If i remove the -with-zlib compile directive from the 5.0.4 version,  both versions work together correctly.

once again, the error message only comes up on the OLDER version, but i suspect the newer version changes something in the database that causes the older version to fail.

here are my compiler directives

./configure 
--prefix=/share/servers/php5 
--with-mysql=/usr/lib/mysql 
--with-apxs=/share/servers/httpd/bin/apxs 
--with-openssl=/share/servers/libs/ssl 
--with-jpeg-dir=/share/servers/libs/jpeg 
--with-freetype-dir=/usr/lib 
--with-gd=/share/servers/libs/gdlib 
--with-mcrypt=/share/servers/libs/mcrypt 
--enable-memory-limit 
--with-config-file-path=/share/servers/php5/conf 
-enable-zlib
--enable-ftp

I am running apache 1.3.33 w/ mod_ssl 2.8.22, here are the versions of all libs that i use for my server.

gd-2.0.33
mm-1.3.1
php-5.0.4
jpeg-6b
mod_ssl-2.8.22-1.3.33
apache_1.3.33
libmcrypt-2.5.7
openssl-0.9.7e
libpng-1.2.7

Reproduce code:
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do any database operation (SELECT, UPDATE, INSERT, DELETE) using PHP 5.0.4 with enable-zlib enabled and the php.ini setting "zlib.output_compression = On"

database queries from a previous version of PHP will fail.

recompile without the -enable-zlib directive, and it will work correctly (after you restore your database tables)

MAKE SURE YOU HAVE A BACKUP OF YOUR DATABASE if you try this.