PHP operation xml_PHP tutorial-PHP Tutorial-php.cn

PHP operation xml_PHP tutorial

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Release： 2016-07-13 10:25:49

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Data to be manipulated

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David Flanagan

Luke Welling
Laura Thomson

David Courley

Several basic concepts of XML
1. Node: Node is the Node used in many programming languages when processing XML. Node is a relatively broad concept. In XML, elements, attributes, namespaces, comments, and text content , processing instructions, and the entire document belong to nodes, that is to say, each independent small part of the XML document is a node, is, So is name="XXXX", the tag is, and even the author's name David Flanagan is a text node.
2. Element: Many programming languages have XML processing. Node is a very broad concept. Because of the need to unify the API, there will not be too many methods for nodes, and Element is a subset of nodes. To put it simply, tags like generally have many operation methods for elements.

3. Attributes: This is easier to understand. Things like XX="OO" in <> are all attribute nodes 4. Escape characters: Similar to HTML, xml also has language occupation Symbols, you need to escape these special characters when you want to use them

DOMDocument object
I use the DOMDocument object to operate xml. I feel that it is more scientific to use than simpleXml. Of course, I used it on the first day php, purely personal feelings. DOMDocument has several commonly used properties and methods.

PHP operation xml_PHP tutorial

Load xml

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The code is as follows:

$path=$_SERVER["DOCUMENT_ROOT"].'/ books.xml'; $books=new DOMDocument(); $books->load($path);

Read/traverse nodes and attributes

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The code is as follows:

$bookElements=$books-> getElementsByTagName('book'); foreach($bookElements as $book){

foreach ($book->attributes as $attr) {

echo strtoupper($attr->nodeName).' —— '.$attr- >nodeValue.'
';
} echo $author->nodeValue.' ;

Of course, for many attributes, if you only want to read one, you can read by index through the item(index) method

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The code is as follows:

echo $book->attributes->item(1)->nodeValue; PHP operation xml_PHP tutorial

You can also query through powerful xpath

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You can also query through the powerful xpath

Modify attributes/nodes

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foreach($bookElements as $book){
foreach ($book->attributes as $attr) {
setAttribute($attr->nodeName,strtoupper ($attr->nodeValue));
$attr->nodeValue=strtoupper($attr->nodeValue);
}
echo "AUTHOR: ";
foreach ($book ->getElementsByTagName('author') as $author) {

} $books->save($path);

To modify attributes, you can directly access its nodeValue changes, or you can use the setAttribute method. Don’t forget to use save after making changes.

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$book->setAttribute($attr->nodeName,strtoupper($attr ->nodeValue));

$attr->nodeValue=strtoupper($attr->nodeValue);

Add elements/attributes

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$newBook=$books->createElement(' book'); #Create a new element

$newBook->setAttribute('name','PHP Objects, Patterns, and Practice');#Create a new attribute, method one

$publisher=$books->createAttribute('publisher');#Create a new attribute, method two $publisher->nodeValue='Apress L.P';

$newBook-> appendChild($publisher); #Add attributes to elements

$author=$books->createElement('author');#Create child element

$author->nodeValue='Matt Zandstra';

$newBook->appendChild($author) ;#Add child elements to parent elements

$books->documentElement->appendChild($newBook);#Add the entire node

$books->save($path);

Delete attributes/nodes

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$first=$bookElements->item(0 );

$first->removeAttribute('publisher');

$second=$bookElements->item(1); $second->parentNode->removeChild($second);

$books->save($path);