DOMNode::normalize()
(PHP 5, PHP 7)
Normalizes the node
说明
public DOMNode::normalize(void): void
Remove empty text nodes and merge adjacent text nodes in this node and all its children.
返回值
没有返回值。
参见
- » The DOM Specification
- DOMDocument::normalizeDocument() Normalizes the document
This is a quote from the DOM level 2 spec, explaining the normalize() function. ---- normalize Puts all Text nodes in the full depth of the sub-tree underneath this Node, including attribute nodes, into a "normal" form where only structure (e.g., elements, comments, processing instructions, CDATA sections, and entity references) separates Text nodes, i.e., there are neither adjacent Text nodes nor empty Text nodes. This can be used to ensure that the DOM view of a document is the same as if it were saved and re-loaded, and is useful when operations (such as XPointer [XPointer] lookups) that depend on a particular document tree structure are to be used. ---- (source: http://www.w3.org/TR/DOM-Level-2-Core/core.html) i.e. the idea of normalize is to make text nodes the same as they would be if the xml document was re-loaded into DOM. It's handy if you want to compare DOM nodes.