Question about modifying xml file values

To modify the xml file value, I want to change the value of question to 22222. this value is passed in at the front end, but I don't know how to transfer it. how should I do it? It is best to use the DOMDocument class for operations.

 
   
  3  admin  
      
         
    
     111111
          
            
     
      A
             
     
      11
                 
            
     
      B
             
     
      22
                 
            
     
      C
             
     
      33
                 
            
     
      D
             
     
      44
               
       
         
    
     22222
          
            
     
      A
             
     
      22
                 
            
     
      B
             
     
      11
                 
            
     
      C
             
     
      44
                 
            
     
      D
             
     
      33
               
       
         
    
     33333
          
            
     
      A
             
     
      444
                 
            
     
      B
             
     
      222
                 
            
     
      C
             
     
      333
                 
            
     
      D
             
     
      2111
               
     
  
 

Reply to discussion (solution)

How do you change it?

$ Fn = 'Your xml filename '; $ tag = 'question'; // The name of the node to be modified $ val = '000000'; // The value of the node to be modified, used together with $ tag to locate $ replace = 'XXX'; // The modified value $ xml = simplexml_load_file ($ fn ); $ p = $ xml-> xpath ("// {$ tag }[. = '$ val'] "); $ p [0] [0] = $ replace; $ xml-> asXML ($ fn); // write back

PHP code? 12345678 $ fn = 'Your xml filename '; $ tag = 'question'; // The name of the node to be modified $ val = '000000'; // The value of the node to be modified, used together with $ tag to locate $ replace = 'XXX'; // The modified value $ xml = simplexml_load_file ($ fn ); $ p = $ xml-> xpath ("// {$ tag }[. = ......

$ P [0] [0] what does it mean?

Xpath returns an array of all conforming nodes (a two-dimensional array of objects)

$ P [0] [0] indicates the first matched node
$ P [0] [0] indicates the first element in the node.

Xpath returns an array of all conforming nodes (a two-dimensional array of objects)

$ P [0] [0] indicates the first matched node
$ P [0] [0] indicates the first element in the node.
In this case, the question is 111111, not 222222.

$ Xml-> xpath ("// {$ tag} [. = '$ VAL']");
The actual execution is
$ Xml-> xpath ("// question [. = '000000']");

Therefore, your data will only match 22222