The minimum requirements for different version of WordPress are different
The minimum requirements for WordPress 3.2 are:
- PHP version 5.2.4 or higher version.
- MySQL version 5.0 or higher version.
- Apache mod rewrite module (If you want Permalinks) (optional) (Mostly used for MultiSite)
The minimum requirements for WordPress 3.1, 3.0, 2.9 are:
- PHP version 4.3 or higher version
- MySQL version 4.1.2. or higher version
- Apache mod rewrite module (If you want Permalinks) (optional) (Mostly used for MultiSite)
The minimum requirements for WordPress 2.8, 2.7, 2.6, 2.5 are:
- PHP version 4.3 or higher version
- MySQL version 4.0 or higher version
- Apache mod rewrite module (If you want Permalinks) (optional) (Mostly used for MultiSite)
The minimum requirements for WordPress 2.3, 2.2, 2.1 are:
- PHP version 4.2 or higher version
- MySQL version 4.0 or higher version
- Apache mod rewrite module (If you want Permalinks) (optional) (Mostly used for MultiSite)
The minimum requirements for WordPress 2.0 are:
- PHP version 4.0 or higher version
- MySQL version 3.23.23 or higher version
- Apache mod rewrite module (If you want Permalinks) (optional) (Mostly used for MultiSite)
For a better efficiency use platform containing Linux Operating System, a NGINX web server or an Apache web server. WordPress will work swiftly on any server that supports MYSQL, PHP and mod rewrite module. Many features of WordPress need remote connection so it is necessary that your host should grant permissions for remote connections. WordPress will not function properly if your HTTP connections are blocked.
For best security purposes you should ask the host to run suPHP or equivalent on web server to make it more secure.