If you are having trouble loading this extension (perhaps with a log message like 'Undefined symbol "dom_node_class_entry"'), make sure that you have xmlreader.so listed AFTER dom.so in php.ini.
The XMLReader extension was initially a PECL extension for PHP 5. It was later moved to the PHP source (bundled) as of PHP 5.1.0, and later enabled by default as of PHP 5.1.2.
This extension is enabled by default. It may be disabled by using the following option at compile time: --disable-xmlreader
Gentoo users: emerge does not compile dev-lang/php with --enable-xmlreader by default. To enable this option, add the flag xmlreader to your USE variable and recompile php.
When you type:
pecl install XMLReader
and installation fails with this error:
Fatal error: Call to undefined function preg_match() in /usr/share/pear/PEAR/Frontend/CLI.php on line 57
You can temporarily fix it by removing the -n flag from the pecl script.
By removing the -n flag it will use your php.ini.