Php ini location joomla hosting

The configuration file

The configuration file ( php.ini ) is read when PHP starts up. For the server module versions of PHP, this happens only once when the web server is started. For the CGI and CLI versions, it happens on every invocation.

• SAPI module specific location (PHPIniDir directive in Apache 2, -c command line option in CGI and CLI, php_ini parameter in NSAPI, PHP_INI_PATH environment variable in THTTPD)
• The PHPRC environment variable. Before PHP 5.2.0, this was checked after the registry key mentioned below.
• As of PHP 5.2.0, the location of the php.ini file can be set for different versions of PHP. The following registry keys are examined in order: [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y.z]. [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y] and [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x]. where x, y and z mean the PHP major, minor and release versions. If there is a value for IniFilePath in any of these keys, the first one found will be used as the location of the php.ini (Windows only).
• [HKEY_LOCAL_MACHINE\SOFTWARE\PHP]. value of IniFilePath (Windows only).
• Current working directory (except CLI).
• The web server's directory (for SAPI modules), or directory of PHP (otherwise in Windows).
• Windows directory ( C:\windows or C:\winnt ) (for Windows), or --with-config-file-path compile time option.

If php-SAPI.ini exists (where SAPI is the SAPI in use, so, for example, php-cli.ini or php-apache.ini ), it is used instead of php.ini. The SAPI name can be determined with php_sapi_name().

The Apache web server changes the directory to root at startup, causing PHP to attempt to read php.ini from the root filesystem if it exists.

Using environment variables can be used in php.ini as shown below.

Example #1 php.ini Environment Variables

The php.ini directives handled by extensions are documented on the respective pages of the extensions themselves. A list of the core directives is available in the appendix. Not all PHP directives are necessarily documented in this manual: for a complete list of directives available in your PHP version, please read your well commented php.ini file. Alternatively, you may find " the latest php.ini from Git helpful too.

Example #2 php.ini example

Since PHP 5.1.0, it is possible to refer to existing .ini variables from within .ini files. Example: open_basedir = $ ":/new/dir".

Scan directories

It is possible to configure PHP to scan for .ini files in a directory after reading php.ini. This can be done at compile time by setting the --with-config-file-scan-dir option. In PHP 5.2.0 and later, the scan directory can then be overridden at run time by setting the PHP_INI_SCAN_DIR environment variable.

It is possible to scan multiple directories by separating them with the platform-specific path separator (; on Windows, NetWare and RISC OS; : on all other platforms; the value PHP is using is available as the PATH_SEPARATOR constant). If a blank directory is given in PHP_INI_SCAN_DIR. PHP will also scan the directory given at compile time via --with-config-file-scan-dir.

Within each directory, PHP will scan all files ending in .ini in alphabetical order. A list of the files that were loaded, and in what order, is available by calling php_ini_scanned_files(). or by running PHP with the --ini option.

in php.ini you can reference to an existing directive or an environment variable using the syntax $.

Here are some examples.

--- $ will be replaced by $_ENV['WINDIR'] at runtime

--- you can set environment variables by Apache and use them in php.ini
--- FcgidInitialEnv AUTHOR "WUXIANCHENG"
--- error_log = "$.log"

--- $ will be replace by the value of sys_temp_dir

Also you can use PHP constants in php.ini, but DONT'T wrap them in $<> or "".

--- it works like this php code:

$error_log = "/data/". PHP_VERSION. "/";

Also a nice feature is the ability to use PHP's contants:
For example:
extension_dir=""PHP_MAJOR_VERSION"."PHP_MINOR_VERSION"/ext"

This solution works for me when I needed to force two diferent versions of PHP on a Windows Server 2012 r2 & IIS:

For one application, map *.php extension to a CgiModule adding the "-c" option to the executable path, like this: "C:\php53\php-cgi.exe -c C:\php53\php.ini"

For the other application, map *.php extension to a CgiModule adding the "-c" option to the executable path, like this: "C:\php54\php-cgi.exe -c C:\php54\php.ini"

I think that way is the cleanest, because there is no need to work with PATH variable or Registry or Windows directory.

Note: for some reason, this didn't work on FastCGI module, related to the way that IIS set the executable tab not allowing command line options.

If you have multiple installations of PHP, and "php --ini" keeps loading the same configuration file for every version instead of the configuration file on the installation path, it might be worthy to check the windows registry.

I found a key on "HEKY_LOCAL_MACHINE\SOFTEARE\Wow6432Node\PHP\IniFilePath" that override any installation, which cause "php --ini" to crash stating a version mismatch with the extensions being loaded.

Deleting the key "HEKY_LOCAL_MACHINE\SOFTEARE\Wow6432Node\PHP" solved the problem.

I guess the key was created with a windows installer for IIS on FastCGI, but just guessing.

For the record, some of the errors thrown are:
"The procedure entry point php_sys_stat could not be located in the dynamic link library php5.dll. "
"The procedure entry point php_checkuid could not be located in the dynamic link library php5.dll. "

Hope someone with such a mess will find this useful.

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