XML DOM in php (11), xmldom_PHP tutorial-PHP Tutorial-php.cn

XML DOM (11) in php, xmldom

7.Create node

In DOM operations, addition, deletion and modification operations must find the parent node

1. DOMElement DOMDocument::createElement ( string $name [, string $value ] )

Create node and return a node object

string $name: the name of the node (element name)

[, string $value]: The value of the node

2. DOMNode DOMNode::appendChild ( DOMNode $newnode )

Append child node

DOMNode $newnode: child node

3. int DOMDocument::save ( string $filename )

Save the data in dom to the specified file

4. The documentElement attribute represents the root node in the dom model

<?<span>php
    header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
    $dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
    $dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 创建节点仅仅是表示在内存中创建出这个节点对象，但这个对象和我们之前的
</span><span>//</span><span> dom模型没有任何联系</span>
    $person = $dom->createElement ( <span>'</span><span>person</span><span>'</span><span> );
    $name </span>= $dom->createElement ( <span>'</span><span>name</span><span>'</span>, <span>'</span><span>huangliu</span><span>'</span><span> );
    $age </span>= $dom->createElement ( <span>'</span><span>age</span><span>'</span>, <span>'</span><span>18</span><span>'</span><span> );
</span><span>//</span><span> 将name和age做为子节点追加至person节点</span>
    $person-><span>appendChild ( $name );
    $person</span>-><span>appendChild ( $age );
</span><span>//</span><span> $dom->getElementsByTagName('persons')->item(0)->appendChild($newnode)
</span><span>//</span><span> 将person做了子节点追加至根节点</span>
    $dom->documentElement-><span>appendChild ( $person );
</span><span>//</span><span> 将dom中的所有数据重新保存到demo01.xml文件中</span>
    $dom->save ( <span>'</span><span>demo01.xml</span><span>'</span> );

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Result:

<person>
        <name>huangliu</name>
        <age><span>18</span></age>
    </person>

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8, delete node

DOMNode DOMNode::removeChild ( DOMNode $oldnode )

DOMNode $oldnode: the node object to be deleted

Example: Delete the following blue part

XML DOM in php (11), xmldom_PHP tutorial php header ( 'Content-Type:text/html;charset=gb2312' ); $dom = new DOMDocument ( '1.0', 'utf-8 ' ); $dom->load ( 'demo01.xml' ); // First find the node object to be deleted $person = $dom->getElementsByTagName ( 'person' )->item ( 1 ); // Delete node $dom->documentElement->removeChild ( $person ); // Resave the file $dom->save ( 'demo01.xml' );

9, modify node

DOMNode DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode )

DOMNode $newnode: New node

DOMNode $oldnode: original node

<?<span>php
    header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
    $dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
    $dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 找到要被替换掉的节点</span>
    $oldNode = $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span> )->item ( <span>2</span><span> );
</span><span>//</span><span> 创建出新的节点</span>
    $person = $dom->createElement ( <span>'</span><span>person</span><span>'</span><span> );
    $name </span>= $dom->createElement ( <span>'</span><span>name</span><span>'</span>, <span>'</span><span>songjiang</span><span>'</span><span> );
    $age </span>= $dom->createElement ( <span>'</span><span>age</span><span>'</span>, <span>100</span><span> );
    $person</span>-><span>appendChild ( $name );
    $person</span>-><span>appendChild ( $age );
</span><span>//</span><span> 用新节点替换原节点</span>
    $dom->documentElement-><span>replaceChild ( $person, $oldNode );
</span><span>//</span><span> 保存文件</span>
    $dom->save ( <span>'</span><span>demo01.xml</span><span>'</span> );

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10, Save

 string DOMDocument::saveXML

Save the data in dom to a string variable

 int DOMDocument::save ( string $filename )

Save the data in dom to the specified file

11, Regarding the addition, deletion and modification of attributes

1. DOMAttr DOMElement::setAttribute( string $name , string $value )

Add attributes

string $name: attribute name

string $value: attribute value

Add the attribute id='s102' to person

XML DOM in php (11), xmldom_PHP tutorial php header ( 'Content-Type:text/html;charset=gb2312' ); $dom = new DOMDocument ( '1.0', 'utf-8 ' ); $dom->load ( 'demo01.xml' ); // Add the id attribute for the second person // Find the second person $person = $dom->getElementsByTagName ( 'person' )->item ( 1 ); // Add id attribute $person->setAttribute ( 'id', 's102' ); // Save file $dom->save ( 'demo01.xml' );

2. DOMAttr DOMElement::setAttribute( string $name , string $value )

Modify attributes

string $name: attribute name

string $value: attribute value

If a node does not have this attribute, it means adding the attribute (note the difference with the above)

If a node already has this attribute, it means modifying the attribute

3. bool DOMElement::removeAttribute ( string $name )

Delete attributes (not delete nodes)

$name: attribute to be deleted

<?<span>php
    header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
    $dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
    $dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 删除第2个人的id属性
</span><span>//</span><span> 找到第二个人</span>
    $person = $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span> )->item ( <span>1</span><span> );
</span><span>//</span><span> 删除id属性</span>
    $person->removeAttribute(<span>'</span><span>id</span><span>'</span><span>);
</span><span>//</span><span> 保存文件</span>
    $dom->save ( <span>'</span><span>demo01.xml</span><span>'</span> );

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4. Get attributes

string DOMElement::getAttribute ( string $name )

string $name: attribute name

<?<span>php
    header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
    $dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
    $dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 查询第1个人的id属性
</span><span>//</span><span> 找到第1个人</span>
    $person = $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span> )->item ( <span>0</span><span> );
</span><span>//</span><span> 查询id属性</span>
    echo $person->getAttribute(<span>'</span><span>id</span><span>'</span>);

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12 SimpleXML

PHP DOM: additions, deletions and modifications

SimpleXML: Query

1. Read xml

1. simpleXMLElement simplexml_load_file (string $filename)

Read data from an xml file

string $filename：xml file name

2. SimpleXMLElement::__construct (string data)

Read data from a string

String data: String in xml format

If the data is saved to a file, use simplexml_load_file to read it