Bug #54333 [NEW]: ini_set zlib.output_compression On returns false

From: Operating system: CentOS 5.5 32bit PHP version: 5.2.17 Package: Zlib related Bug Type: Bug Bug description:ini_set zlib.output_compression On returns false Description: ------------ PHP is compiled with the following options: System => Linux serv01.testmachine.com 2.6.28.5-grsec-sg2 #6 SMP Fri Feb 20 02:45:11 CST 2009 i686 Build Date => Mar 21 2011 10:04:49 Configure Command => './configure' '--prefix=/usr/local/php52' '--mandir=/usr/man' '--with-config-file-path=/usr/local/php52/lib' '--with-config-file-scan-dir=/usr/local/php52/etc' '--with-pear=/usr/local/php52/pear' '--with-litespeed' '--enable-discard-path' '--enable-sigchild' '--disable-fastcgi' '--enable-magic-quotes' '--with-db4' '--disable-force-cgi-redirect' '--disable-ipv6' '--with-openssl' '--with-zlib' '--with-zlib-dir' '--enable-bcmath' '--with-bz2' '--enable-calendar' '--with-curl' '--with-curlwrappers' '--enable-exif' '--enable-ftp' '--with-kerberos' '--with-gd' '--with-pspell' '--with-libedit' '--with-jpeg-dir' '--with-png-dir' '--with-xpm-dir' '--with-freetype-dir' '--with-t1lib' '--enable-gd-native-ttf' '--with-ttf' '--with-gettext' '--with-imap' '--with-imap-ssl' '--with-ldap' '--with-ldap-sasl' '--enable-mbstring' '--with-mcrypt' '--with-mhash' '--with-mysql' '--with-mysql-sock=/var/lib/mysql/mysql.sock' '--with-mysqli' '--with-ncurses' '--enable-pcntl' '--with-pdo-mysql' '--with-pdo-pgsql' '--with-pgsql' '--with-readline' '--enable-shmop' '--with-snmp=shared' '--enable-ucd-snmp-hack' '--enable-soap' '--enable-sockets' '--enable-sqlite-utf8' '--enable-wddx' '--with-tidy' '--with-xmlrpc' '--enable-zip' '--with-xsl=/usr' '--with-libxml-dir=/usr' '--enable-zend-multibyte' In the master php.ini file zlib.output_compression is set to off as reported by phpinfo(); zlib.output_compression => Off => Off Many applications are using the code shown in the test script to initiate the compression of their headers. With PHP 5.2.17 from the stable repo (snaps too!) return false on the following line: $r = @ini_set('zlib.output_compression', 'On'); Even it is returning false zlib.output_compression is actually enabled and when it reaches ob_start('ob_gzhandler'); because of the false results the following error is produced: [21-Mar-2011 03:18:43] PHP Warning: ob_start() [<a href='ref.outcontrol'>ref.outcontrol</a>]: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in /home/jeepchic/public_html/header.php on line 767 Test case script I provided here works just fine on PHP 5.2.9. Test script: --------------- <? if (function_exists('gzopen')) { $r = @ini_set('zlib.output_compression', 'On'); $r2 = @ini_set('zlib.output_compression_level', '3'); if (!$r || !$r2) { echo "Fail\n"; ob_start('ob_gzhandler'); } else { echo "success\n"; } } else { echo "Fallback\n"; ob_start('ob_gzhandler'); } ?> Expected result: ---------------- echo "success\n"; Actual result: -------------- echo "Fail\n"; -- Edit bug report at http://bugs.php.net/bug.php?id=54333&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=54333&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=54333&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=54333&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=54333&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54333&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=54333&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=54333&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=54333&r=needscript Try newer version: http://bugs.php.net/fix.php?id=54333&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=54333&r=support Expected behavior: http://bugs.php.net/fix.php?id=54333&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=54333&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=54333&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=54333&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54333&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=54333&r=dst IIS Stability: http://bugs.php.net/fix.php?id=54333&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=54333&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=54333&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=54333&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=54333&r=mysqlcfg