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Using PHP4 with the Zeus Web Server ----------------------------------- Zeus fully supports running PHP in combination with our webserver. A significant improvement in PHP 4 is that you can now run PHP as an ISAPI module, giving great performance benefits over traditional CGI code. Note that you will need to be running at least version 3.3.6 of the webserver. If you are running an earlier version, please see our website (http://www.zeus.com) for upgrade instructions. To build the ISAPI version of PHP, start the configuration with: ./configure --with-zeus=/usr/local/zeus Obviously, replace /usr/local/zeus with the location of where you have installed Zeus on your machine. For PHP to build successfully, you need to have 3.3.6 already installed, because the code relies on the presence of header files provided with the latest version. You may have to adjust the environment variable LDFLAGS and EXTRA_LIBS in order to link in extra libraries. This depends on the platform on which you are building and also on the compiler used (see below). A standard GNU/Linux install with GCC should build fine with no changes. Configuring the webserver ------------------------- After running 'make' and 'make install', you will have a 'libphp4.so' file. Copy this file into a directory reserved for ISAPI binaries. Now, perform the following steps for each virtual server that you wish to run PHP on: 1) On the Admin server, go to 'edit server->path mapping' 2) Add an alias to the directory with libphp4.so in it, mapped to /isapi/ (or a location of your choice). Make sure you set the alias type to ISAPI. 3) Click 'update' 4) Add a handler for file extension 'php' to be run by /isapi/libphp4.so 5) Click 'update', then go back to the previous page. 6) Click on the 'module configuration' button, ensure that ISAPI support is ticked. 7) Click on the ISAPI link. At the bottom of the page, click the checkbox for running ISAPI extensions 'out of process'. 8) Click 'update'. Then restart the virtual server. Done! Troubleshooting --------------- *) Why does my PHP library fail to load? After configuring Zeus, if you get a '502 Bad Gatway' error when accessing a PHP page, there are problems loading the PHP library. Check the error log ($ZEUSHOME/web/log/errors) for errors. Failing to load the PHP ISAPI module is likely to be due to unresolved symbols in the module. A way to check for this is to visit our support page at http://support.zeus.com/faq/entries/isapi_error.html and run the program there on your libphp4.so. It will list any unresolved symbols. *) My libphp4.so has unresolved symbols. How do I fix this? You must ensure that the PHP build process links in the appropriate libraries that contain these symbols! The libraries required will depend on the platform you are running PHP on. You may need to set one or two environment variables before running the 'configure' program to set up PHP; LDFLAGS and EXTRA_LIBS. Make sure that you also export these variables to the build process. (Type 'export LDFLAGS EXTRA_LIBS' in the shell to do this.) Specific examples: Solaris + gcc: Set LDFLAGS to '-L/usr/local/egcs/lib/gcc-lib/sparc-sun-solaris2.7/egcs-2.91.66 -L/usr/local/egcs/lib' (your paths may vary) EXTRA_LIBS should be '-lgcc' FreeBSD 4.0 + gcc: Set EXTRA_LIBS to '-lc_r_p -lgcc' Linux/Alpha: Set EXTRA_LIBS to '-lstdc++-3-libc6.1-2-2.10.0' (change as appropriate to the stdc++ in /usr/lib) For more information and help with Zeus, please visit our website: http://www.zeus.com