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 ships with PHP source. 此扩展默认为启用，编译时可通过下列选项禁用： --disable-xmlreader
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.
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.