Cpanel Important PHP options
Most PHP options simply enable an extension that is shipped with PHP.
CGI — This option is enabled by default. Disabling this option will cause a PHP CLI binary to install in /usr/bin/php and /usr/local/bin/php. When no CGI binary is available, your server will be unable to serve PHP requests without DSO.
Concurrent DSO patch — By default, Apache is unable to load libphp4 and libphp5 simultaneously. This option applies a patch to PHP that versions objects in libphp4 and libphp5. This option will also create new Apache directives so that both PHP 4 and 5 can be communicated with separately.
This option is not required if you will serve both versions of PHP via SuPHP, CGI, or FCGID.
Important: Compiled PHP extensions other than those shipped with PHP will not function correctly with this patch enabled. Enabling this module may also render some PECL and PEAR modules nonfunctional. Do not use this module unless you must serve both PHP 4 and 5 as DSOs and can work around other issues it will case.
Reference: http://cpanel.net/
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