DOMDocument class: Check out the PHP Manual entry for this class, which represents an entire HTML or XML document and serves as the root of the document tree.
DOMDocument类：查阅有关这个类的PHPManual项，这个类代表了整个HTML或XML文档并充当文档树的根。
DOMDocument class: Check out the PHP Manual entry for this class, which represents an entire HTML or XML document and serves as the root of the document tree.
DOMDocument类：查阅有关这个类的PHPManual项，这个类代表了整个HTML或XML文档并充当文档树的根。
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