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PHP: DOMDocument->getElementById() - Manual
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DOMDocument->createTextNode()DOMDocument->getElementById()
(No version information available, might be only in CVS)
DOMDocument->getElementById() — Searches for an element with a certain id
说明
DOMDocument
DOMElement getElementById ( string $elementId )
This function is similar to DOMDocument->getElementsByTagName() but searches for an element with a given id.
For this function to work, you will need either to set some ID attributes with DOMElement->setIdAttribute() or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with DOMDocument->validate() or DOMDocument->validateOnParse before using this function.
参数
- elementId
-
The unique id value for an element.
返回值
Returns the DOMElement or NULL if the element is not found.
范例
Example#1 DOMDocument->getElementById() Example
<?php
$doc = new DomDocument ;
// We need to validate our document before refering to the id
$doc -> validateOnParse = true ;
$doc -> Load ( 'book.xml' );
echo "The element whose id is books is: " . $doc -> getElementById ( 'books' )-> tagName . "\n" ;
?> 上例将输出：
The element whose id is books is: chapter
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