PHP XMLReader setRelaxNGSchemaSource()用法及代码示例

XMLReader::setRelaxNGSchemaSource()函数是PHP中的内置函数，用于设置包含RelaxNG Schema的数据以用于验证。 setRelaxNGSchemaSource()函数不同于setRelaxNGSchema()函数，因为前者将规则接受为字符串变量，而后者将规则接受为.rng文件。

用法:

bool XMLReader::setRelaxNGSchemaSource( string $source )

参数：此函数接受单个参数$source，该参数包含包含RelaxNG Schema的字符串。

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::setRelaxNGSchemaSource()函数：

范例1：

data.xml

<?xml version="1.0"?> 
<body> 
    <div> 
        <h1>GeeksForGeeks</h1> 
        <p>Portal for Geeks</p> 
    </div> 
    <div> 
        <h1>Heading 3</h1> 
        <p>Heading 4</p> 
    </div> 
</body>

index.php

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Open the XML file 
$XMLReader->open('data.xml'); 
  
// Create rule as a string 
$RNG = "<element name=\"body\" 
xmlns=\"http://relaxng.org/ns/structure/1.0\"> 
<zeroOrMore> 
  <element name=\"div\"> 
    <element name=\"h1\"> 
      <text/> 
    </element> 
    <element name=\"p\"> 
      <text/> 
    </element> 
  </element> 
</zeroOrMore> 
</element>"; 
  
// Load the rule 
$XMLReader->setRelaxNGSchemaSource($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 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!

范例2：

data.xml

<?xml version="1.0"?> 
<body> 
    <div> 
        <!--Create empty div element 
           to violate rule-->
    </div> 
    <div> 
        <h1>Heading 3</h1> 
        <h2>Heading 4</h2> 
    </div> 
</body>

index.php

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Open the XML file 
$XMLReader->open('data.xml'); 
  
// Create rule as a string 
$RNG = "<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>"; 
  
// Load the rule 
$XMLReader->setRelaxNGSchemaSource($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!

参考： https://www.php.net/manual/en/xmlreader.setrelaxngschemasource.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 setRelaxNGSchemaSource() 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。