DOMDocument::createAttributeNS

(PHP 5, PHP 7, PHP 8)

DOMDocument::createAttributeNS — Create new attribute node with an associated namespace

说明

public DOMDocument::createAttributeNS(?string $namespace, string $qualifiedName): DOMAttr|false

This function creates a new instance of class DOMAttr. 此节点出现在文档中，除非是用诸如 DOMNode->appendChild() 等函数来将其插入。

参数

namespace: The URI of the namespace.
qualifiedName: The tag name and prefix of the attribute, as prefix:tagname.

返回值

The new DOMAttr or false if an error occurred.

错误／异常

DOM_INVALID_CHARACTER_ERR: Raised if qualifiedName contains an invalid character.
DOM_NAMESPACE_ERR: Raised if qualifiedName is a malformed qualified name, or if qualifiedName has a prefix and namespace is null.

参见

DOMNode::appendChild() - Adds new child at the end of the children
DOMDocument::createAttribute() - Create new attribute
DOMDocument::createCDATASection() - Create new cdata node
DOMDocument::createComment() - Create new comment node
DOMDocument::createDocumentFragment() - Create new document fragment
DOMDocument::createElement() - Create new element node
DOMDocument::createElementNS() - Create new element node with an associated namespace
DOMDocument::createEntityReference() - Create new entity reference node
DOMDocument::createProcessingInstruction() - Creates new PI node
DOMDocument::createTextNode() - Create new text node

add a note

User Contributed Notes 1 note

down

_ michael ¶

12 years ago


If a new namespace is introduced while creating and inserting an attribute, createAttributeNS() does not behave in the same way as createElementNS().

(1) Location: With createAttributeNS(), the new namespace is declared at the level of the document element. By contrast, createElementNS() declares the new namespace at the level of the affected element itself.

(2) Timing: With createAttributeNS(), the new namespace is declared in the document as soon as the attribute is created - the attribute does not actually have to be inserted. createElementNS() doesn't affect the document as long as the element is not inserted.

An example:

<?php
    
    $source = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<root><tag></tag></root>
XML;
    
    /*
     
     I. createAttributeNS:
     * a new namespace shows up immediately, even without insertion of the attribute
     * the new namespace is declared at the level of the document element
     
    */
    
    $doc = new DOMDocument( '1.0' );
    $doc->loadXML( $source );
    
    // (1) We just create a "namespace'd" attribute without appending it to any element.
    $attr_ns = $doc->createAttributeNS( '{namespace_uri_here}', 'example:attr' );
    
    print $doc->saveXML() . "\n";
    
    /*
      Result: The namespace declaration appears, having been added to the document element. Output:
      
      <?xml version="1.0" encoding="UTF-8"?>
      <root xmlns:example="{namespace_uri_here}"><tag/></root>
      
    */
    
    // (2) Next, we give the attribute a value and insert it.
    $attr_ns->value = 'value'; 
    $doc->getElementsByTagName( 'tag' )->item(0)->appendChild( $attr_ns );
    
    print $doc->saveXML() . "\n";
    
    /*
      Result: The "namespace'd" attribute shows up as well. Output:
      
      <?xml version="1.0" encoding="UTF-8"?>
      <root xmlns:example="{namespace_uri_here}"><tag example:attr="value"/></root>
      
    */
    
    /*
     
     II. createElementNS:
     * a new namespace shows up only when the element is inserted
     * the new namespace is declared at the level of the inserted element
     
    */
    
    $doc = new DOMDocument( '1.0' );
    $doc->loadXML( $source );
    
    // (1) We create a "namespace'd" element without inserting it into the document.
    $elem_ns = $doc->createElementNS( '{namespace_uri_here}', 'example:newtag' );
    
    print $doc->saveXML() . "\n";
    
    /*
      Result: The document remains unchanged. Output:
      
      <?xml version="1.0" encoding="UTF-8"?>
      <root><tag/></root>
      
    */
    
    // (2) Next, we insert the new element.
    $doc->getElementsByTagName( 'tag' )->item(0)->appendChild( $elem_ns );
    
    print $doc->saveXML() . "\n";
    
    /*
      Result: The namespace declaration appears, and it is embedded in the element using it. Output:
      
      <?xml version="1.0" encoding="UTF-8"?>
      <root><tag><example:newtag xmlns:example="{namespace_uri_here}"/></tag></root>
      
    */
    
?>

add a note

官方地址：https://www.php.net/manual/en/domdocument.createattributens.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 ADORecordSet对象 adodb手册 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 mysql面试题 PHPMailer设置utf8 PHPMailer字符集CharSet PHP json解析（json_decode）页面工具 php中几种注释规范 [原创]诡异的php-fpm超时问题 php上周一、本周一、下周一日期 php扩展开发 PHP获取指定函数定义在哪个文件中及行号两千行PHP学习笔记

略微加速

PHP官方手册 - 互联网笔记

DOMDocument::createAttributeNS

说明

参数

返回值

错误／异常

参见

User Contributed Notes 1 note