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This page collects information about incompability of WordPress with PHP 4 versions. Despite the minimum requirements given on wordpress.org it is highly recommended to run wordpress on a PHP 5.2 (and hopefully soon 5.3) setup.
- EOL Whitespaces - Checking out SVN Trunk to a windows system will break wordpress. Because of the 'svn:eol-style' set to 'native' SVN property. Same for certain unzip and FTP programs (It's said that the PHP interpreter can deal with it since PHP 4.3.10 and PHP 5.0.2). Do not copy over files with \r\n EOL on a unix machine.
- SPL Filter IDs
- Nacin talked about some XML stuff for starters that does not work with WP on PHP 4