Improvement on generating rss files in php-php Tutorial

I wrote a php code that uses the DOMDocument component to generate an rss file. However, the code is too bloated and I want to encapsulate it into a class but it has never been successful.
The generated rss is generally like this.





1 123 Wood
1
Http://www.xxx.com </link>
Id: 1, user_name:, pass: 123, real_name: Wood




2 456 Small Wood
2
Http://www.xxx.com </link>
Id: 2, user_name:, pass: 456, real_name: xiaowood





Of course the code is too redundant



$ Doc = new DOMDocument ('1. 0', 'utf-8 ');
$ Doc-> formatOutput = true;


// Create a tag
// Create an rss label
$ Rss = $ doc-> createElement ('RSS ');
// Create a tag under the channel
$ Channel = $ doc-> createElement ('channel ');
$ Ctitle = $ doc-> createElement ('title ');
$ Clink = $ doc-> createElement ('link ');
$ Cdescription = $ doc-> createElement ('Description ');






Foreach ($ arr as $ key => $ val ){
// Create an item tag
$ Item = $ doc-> createElement ('ITEM ');
// Create a sub-label under item
$ User = $ doc-> createElement ('user ');
$ Ititle = $ doc-> createElement ('title ');
$ Ilink = $ doc-> createElement ('link ');
$ Ideelement = $ doc-> createElement ('Description ');
// Create a user tag
$ User_id = $ doc-> createElement ('User _ id ');
$ User_name = $ doc-> createElement ('User _ name ');
$ User_pass = $ doc-> createElement ('User _ pass ');
$ Real_name = $ doc-> createElement ('Real _ name ');
/* Here is the place where the database needs to be called cyclically */
// Create content
// Create the tag content under the item
$ C_ititle = $ doc-> createTextNode ($ val ['User _ id']);
$ C_ilink = $ doc-> createTextNode ('http: // www.xxx.com ');
$ C_ide.pdf = $ doc-> createTextNode ('Id :'. $ val ['User _ id']. ', user_name :'. $ val ['User _ name']. ', pass :'. $ val ['pass']. ', real_name :'. $ val ['real _ name']);
// Create the tag content under the user
$ C_user_id = $ doc-> createTextNode ($ val ['User _ id']);
$ C_user_name = $ doc-> createTextNode ($ val ['User _ name']);
$ C_user_pass = $ doc-> createTextNode ($ val ['pass']);
$ C_real_name = $ doc-> createTextNode ($ val ['real _ name']);
// Create the item property value
$ A_id = $ doc-> createTextNode ($ val ['User _ id']);


// Create attributes
$ Attributes = $ doc-> createAttribute ('id ');
/* Here is the place where the database needs to be called cyclically */
// Inherit the element content of the item-level label
$ Ititle-> appendChild ($ c_ititle );
$ Ilink-> appendChild ($ c_ilink );
$ IDevice-> appendChild ($ c_idevice );
// Inherit the element content of the user-level label
$ User_id-> appendChild ($ c_user_id );
$ User_name-> appendChild ($ c_user_name );
$ User_pass-> appendChild ($ c_user_pass );
$ Real_name-> appendChild ($ c_real_name );
/* Here is the place where the database needs to be called cyclically */
// Inherit
$ Channel-> appendChild ($ item );
// Tag inheritance of item-level labels
$ Item-> appendChild ($ user );
$ Item-> appendChild ($ ititle );
$ Item-> appendChild ($ ilink );
$ Item-> appendChild ($ ide.pdf );
// Id = 1
$ Attributes-> appendChild ($ a_id );
//
$ Item-> appendChild ($ attributes );


// Tag inheritance of item-level labels
$ User-> appendChild ($ user_id );
$ User-> appendChild ($ user_name );
$ User-> appendChild ($ user_pass );
$ User-> appendChild ($ real_name );
}




// Create content
// Create the tag content under the channel
$ C_ctitle = $ doc-> createTextNode ('test rss ');
$ C_clink = $ doc-> createTextNode ('http: // www.xxx.com ');
$ C_cdescription = $ doc-> createTextNode ('This is a test rss ');
// Create an rss version attribute value
$ Rss_attribute_c = $ doc-> createTextNode ('2. 0 ');


// Create an rss version attribute
$ Rss_attribute = $ doc-> createAttribute ('version ');


// Inherit
// Element content inheritance of channel-level labels
$ Ctitle-> appendChild ($ c_ctitle );
$ Clink-> appendChild ($ c_clink );
$ Cdescription-> appendChild ($ c_cdescription );
// Version = "2.0"
$ Rss_attribute-> appendChild ($ rss_attribute_c );




// Channel-level label inheritance
$ Channel-> appendChild ($ ctitle );
$ Channel-> appendChild ($ clink );
$ Channel-> appendChild ($ cdescription );








// Create the root node
$ Rss-> appendChild ($ channel );
$ Rss-> appendChild ($ rss_attribute );
$ Doc-> appendChild ($ rss );


// Save the xml file
$ Doc-> save ('Hello. XML ');


Function connect_ SQL (){
$ Con = mysql_connect ('localhost', 'root', '000000') or die ('MySQL error: '. mysql_error ());
Mysql_select_db ('test ');
Mysql_query ('set names utf8 ');
}
Function getall (){
$ SQL = "SELECT * FROM test ";
$ Query = mysql_query ($ SQL );
$ Content = array ();
While ($ row = mysql_fetch_array ($ query )){
$ Content [] = $ row;
}
Return $ content;
}


I have tried it and I have never been able to convert it into a class.

Reply to discussion (solution)

Why dom?
Is it okay to assemble strings directly? For example

$ar = array(  array(    'id' => 1,    'user' => array('user_id' => 1, 'user_name' => '', 'user_pass' => 123, 'real_name' => 'aa'),     'title' => 1,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:123,real_name:aa',  ),  array(    'id' => 2,    'user' => array('user_id' => 2, 'user_name' => '', 'user_pass' => 456, 'real_name' => 'bb'),     'title' => 2,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:456,real_name:bb',  ),);

    
     
      
       1
      
      
       1
       http://www.xxx.com</link>
       
        id:1,user_name:,pass:123,real_name:aa
       
      
     
     
      
       2
      
      
       2
       http://www.xxx.com</link>
       
        id:1,user_name:,pass:456,real_name:bb
       
      
     
    

Why dom?
Is it okay to assemble strings directly? For example

$ar = array(  array(    'id' => 1,    'user' => array('user_id' => 1, 'user_name' => '', 'user_pass' => 123, 'real_name' => 'aa'),     'title' => 1,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:123,real_name:aa',  ),  array(    'id' => 2,    'user' => array('user_id' => 2, 'user_name' => '', 'user_pass' => 456, 'real_name' => 'bb'),     'title' => 2,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:456,real_name:bb',  ),);

    
     
      
       1
      
      
       1
       http://www.xxx.com</link>
       
        id:1,user_name:,pass:123,real_name:aa
       
      
     
     
      
       2
      
      
       2
       http://www.xxx.com</link>
       
        id:1,user_name:,pass:456,real_name:bb
       
      
     
    

Directly output the echo, and then write fwrite to an xml file. this is a good way, but I think php has its own domdocument component, so it is not clear whether it has its advantages over directly piecing together to generate a file.