how to add php tags with the dom parser

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I create some HTML Templates with php doms functionality, now i like to add some php tags into my template i.e.

$input = $this->dom->createElement(\'in


                      
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                  一向        
                
              
                            
                2021-01-13 06:38
              
            
            
                                                                       
You need a Processing Instruction

$php = $dom->createProcessingInstruction('php', 'echo $foo->bar;');


Full example:

$dom = new DOMDocument;
$dom->loadXml('<html><head><title>Test</title></head><body/></html>');
$dom->getElementsByTagName('body')->item(0)->appendChild(
    $dom->createProcessingInstruction('php', 'echo $foo->bar;')
);
$dom->format = TRUE;
echo $dom->saveXML();


Result:

<?xml version="1.0"?>
<html>
  <head>
    <title>Test</title>
  </head>
  <body>
    <?php echo $foo->bar;?>
  </body>
</html>

                                                                        
                                                        
            
            
              
                
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