DOMDocument->getElementById()
(no version information, might be only in CVS)
DOMDocument->getElementById() -- Searches for an element with a certain id
说明
class
DOMDocument {
DOMElement
getElementById ( string elementId )
}
This function is similar to
DOMDocument->getElementsByTagName() but
searches for an element with a given id.
According to the DOM standard this requires a DTD which defines the
attribute ID to be of type ID. You 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.
例
例子 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";
?>
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上例将输出： The element whose id is books is: chapter |
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