PHP DOMElement removeAttributeNS()用法及代码示例

DOMElement::removeAttributeNS()函数是PHP中的内置函数，用于从元素中删除特定命名空间中具有特定本地名称的属性。

用法:

bool DOMElement::removeAttributeNS( string $namespaceURI, string $localName )

参数：该函数接受上述和以下描述的两个参数：

$namespaceURI:它指定名称空间URI。
$localName:它指定本地名称。

返回值：如果成功，则此函数返回TRUE；如果失败，则返回FALSE。

异常：当节点为只读时，此函数将抛出DOM_NO_MODIFICATION_ALLOWED_ERR。

以下示例说明了PHP中的DOMElement::removeAttributeNS()函数：

范例1：

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html xmlns:x=\"my_namespace\"> 
        <x:h1 x:id=\"my_id\"> Geeksforgeeks </x:h1> 
        <x:h2> Second heading </x:h2> 
    </html> 
    <html xmlns:y=\"another_namespace\"> 
        <y:h1 id=\"my_new_id\"> Random text </y:h1> 
        <y:h2> Another heading </y:h2> 
    </html> 
</root>"); 
  
// Get the elements 
$nodes = $dom->getElementsByTagName('h1'); 
  
echo "Before the removal of attributes:<br>"; 
  
foreach ($nodes as $node) { 
  
    // Get the attribute name and value 
    $attribute = $node->attributes->item(0); 
    $attribute_name = $attribute->name; 
    $attribute_value = $attribute->value; 
  
    echo $attribute_name . ' => '; 
    echo $attribute_value . '<br>'; 
  
    // Remove the id attribute 
    $node->removeAttributeNS('my_namespace', 'id'); 
} 
  
echo "<br>After the removal of attributes:<br>"; 
  
foreach ($nodes as $node) { 
    // Get the attribute name and value 
    $attribute = $node->attributes->item(0); 
    $attribute_name = $attribute->name; 
    $attribute_value = $attribute->value; 
    echo $attribute_name . ' => '; 
    echo $attribute_value . '<br>'; 
} 
?>

输出：

Before the removal of attributes:
id => my_id
id => my_new_id

After the removal of attributes:
=>  // Empty string means attribute is removed
id => my_new_id

范例2：

<?php 
   
// Create a new DOMDocument 
$dom = new DOMDocument(); 
   
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html xmlns:x=\"my_namespace\"> 
        <x:h1 x:id=\"my_id\">  
        Geeksforgeeks  
        </x:h1> 
        <x:h2> Second heading </x:h2> 
    </html> 
    <html xmlns:y=\"another_namespace\"> 
        <y:h1 y:id=\"my_new_id\"  
         y:style=\"color:blue;\"> 
         Random text  
         </y:h1> 
        <y:h2> Another heading </y:h2> 
    </html> 
</root>"); 
   
// Get the elements 
$node = $dom->getElementsByTagName('h1')[1]; 
    
echo "Before the removal of attributes:<br>"; 
   
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
    
// Remove the id attribute 
$node->removeAttributeNS('another_namespace', 'id'); 
    
echo "<br>After the removal of attributes:<br>"; 
    
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
?>

输出：

Before the removal of attributes:
No of attributes => 2
After the removal of attributes:
No of attributes => 1

参考： https://www.php.net/manual/en/domelement.removeattributens.php

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注：本文由纯净天空筛选整理自gurrrung大神的英文原创作品 PHP | DOMElement removeAttributeNS() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。