php.ini是随Web服务器启动时载入的，php.ini搜索位置如下： ============================================================== http://www.php.net/manual/en/configuration.file.phpphp.ini is searched in these locations (in order): ■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 these keys, then 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 ========================================================================= 在IIS下面应该只能载入一个php.ini
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http://www.php.net/manual/en/configuration.file.phpphp.ini is searched in these locations (in order): ■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 these keys, then 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
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在IIS下面应该只能载入一个php.ini