PHP DOMDocument relaxNGValidate()用法及代码示例

DOMDocument::relaxNGValidate()函数是PHP中的内置函数，用于对文档执行RelaxNG验证。 RelaxNG是DDT的替代方法，它定义了XML文档必须遵循的结构。

用法:

bool DOMDocument::relaxNGValidate( string $filename )

参数：该函数接受一个包含RNG文件的参数$filename。

返回值：如果成功，则此函数返回TRUE；如果失败，则返回FALSE。

下面给出的程序说明了PHP中的DOMDocument::relaxNGValidate()函数：

程序1:

• 档案名称：rule.rng

  <element name="college" 
    xmlns="http://relaxng.org/ns/structure/1.0"> 
    <zeroOrMore> 
      <element name="rollno"> 
        <element name="name"> 
          <text/> 
        </element> 
        <element name="subject"> 
          <text/> 
        </element> 
      </element> 
    </zeroOrMore> 
  </element>
• 档案名称：index.php

  <?php 
    
  // Create a new DOMDocument 
  $doc = new DOMDocument; 
    
  // Load the XML 
  $doc->loadXML("<?xml version=\"1.0\"?> 
  <college> 
    <rollno> 
      <name>John Smith</name> 
      <subject>Web</subject> 
    </rollno> 
    <rollno> 
      <name>John Doe</name> 
      <subject>CSE</subject> 
    </rollno> 
  </college>"); 
    
  // Check if XML follows the relaxNG rule 
  if ($doc->relaxNGValidate('rule.rng')) { 
      echo "This document is valid!\n"; 
  } 
  ?>
• 输出：

  This document is valid!

程序2:

• 档案名称：rule.rng

  <element name="company" 
    xmlns="http://relaxng.org/ns/structure/1.0"> 
    <zeroOrMore> 
      <element name="employee"> 
        <element name="name"> 
          <text/> 
        </element> 
        <element name="salary"> 
          <text/> 
        </element> 
      </element> 
    </zeroOrMore> 
  </element>
• 档案名称：index.php

  <?php 
    
  // Create a new DOMDocument 
  $doc = new DOMDocument; 
    
  // Load the XML 
  $doc->loadXML("<?xml version=\"1.0\"?> 
  <company> 
    <employee> 
      <name>John Smith</name> 
      <salary>Web</salary> 
    </employee> 
    <employee> 
      <!-- Do not add salary to voilate rule --> 
      <name>John Doe</name> 
    </employee> 
  </company>"); 
    
  // Check if XML doesn't follows the relaxNG rule 
  if (!$doc->relaxNGValidate('rule.rng')) { 
      echo "This document is not valid!\n"; 
  } 
  ?>
• 输出：

  This document is not valid!

参考： https://www.php.net/manual/en/domdocument.relaxngvalidate.php