Php/docs/xmlreader.installation
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安装
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.
此扩展默认为启用，编译时可通过下列选项禁用： --disable-xmlreader
