PHP XMLReader setRelaxNGSchema()用法及代码示例

XMLReader::setRelaxNGSchema()函数是PHP中的内置函数，用于为RelaxNG Schema设置文件名或URI以用于验证。

用法:

bool XMLReader::setRelaxNGSchema( string $filename )

参数：该函数接受单个参数$filename，该参数包含指向RelaxNG Schema的文件名或URI。

返回值：如果成功，此函数将返回TRUE，否则将返回FALSE。

以下示例说明了PHP中的XMLReader::setRelaxNGSchema()函数：

范例1：

data.xml(要验证的XML文件)

<?xml version="1.0"?> 
<body> 
    <div> 
        <h1>Heading 1</h1> 
        <h2>Heading 2</h2> 
    </div> 
    <div> 
        <h1>Heading 3</h1> 
        <h2>Heading 4</h2> 
    </div> 
</body>

规则(XML文件要遵循的规则)

<element name="body" 
  xmlns="http://relaxng.org/ns/structure/1.0"> 
  <zeroOrMore> 
    <element name="div"> 
      <element name="h1"> 
        <text/> 
      </element> 
      <element name="h2"> 
        <text/> 
      </element> 
    </element> 
  </zeroOrMore> 
</element>

index.php(PHP脚本运行验证器)

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Open the XML file 
$XMLReader->open('data.xml'); 
  
// Load the rule file 
$XMLReader->setRelaxNGSchema('rule.rng'); 
  
// Iterate through the XML nodes 
// and validate each node 
while ($XMLReader->read()) { 
    if ($XMLReader->nodeType == XMLREADER::ELEMENT) { 
  
        // Check if XML follows the relaxNG rule 
        if ($XMLReader->isValid()) { 
            echo "This document is valid!<br>"; 
        } 
  
    } 
} 
?>

输出：

This document is valid!
This document is valid!
This document is valid!
This document is valid!
This document is valid!
This document is valid!
This document is valid!

程序2:

data.xml

<?xml version="1.0"?> 
<body> 
    <div> 
        <!--Remove Heading 1 
          to violate rule-->
        <h2>Heading 2</h2> 
    </div> 
    <div> 
        <h1>Heading 3</h1> 
        <h2>Heading 4</h2> 
    </div> 
</body>

规则

<element name="body"
  xmlns="http://relaxng.org/ns/structure/1.0"> 
  <zeroOrMore> 
    <element name="div"> 
      <element name="h1"> 
        <text/> 
      </element> 
      <element name="h2"> 
        <text/> 
      </element> 
    </element> 
  </zeroOrMore> 
</element>

index.php

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Open the XML file 
$XMLReader->open('data.xml'); 
  
// Load the rule file 
$XMLReader->setRelaxNGSchema('rule.rng'); 
  
// Iterate through the XML nodes 
while ($XMLReader->read()) { 
    if ($XMLReader->nodeType == XMLREADER::ELEMENT) { 
  
        // Check if XML follows the relaxNG rule 
        if (!$XMLReader->isValid()) { 
            echo "This document is not valid!<br>"; 
        } 
  
    } 
} 
?>

输出：

This document is not valid!
This document is not valid!
This document is not valid!
This document is not valid!

参考： https://www.php.net/manual/en/xmlreader.setrelaxngschema.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 | XMLReader setRelaxNGSchema() 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。