How to insert HTML code blocks in PHP

I use PHP to query records from MySQL and then want to display different fields in different text in the form, and update the data.
Want to insert a more complex form, with ECHO is too error-prone, you big God, there is no other way to achieve ah, kneel beg!

Reply to discussion (solution)

Package good one a small function, the face of interface programming is simple.

The form code is statically written in a PHP file, and the PHP code outputs the queried data as a JS object, and then the DOM operation assigns values to the form elements, for example:

 
  Untitled Document

 
  Untitled Document

Dizzy.. I complicate the simple question again. Output large pieces of HTML code can do this:

$ar = Array (' demo ' = ' 111 ', ' test ' = ' 222 '); $html = <<
 
   
   
 
 
   
 Well, thank you, man. I also need the answer to this question. hehe 
 
   
 You can consider a template, such as Smarty 
 
   
 
 
   
 PHP code 
 $ar = Array (' demo ' = ' 111 ', ' test ' = ' 222 ');
 
 $html = << 
   
    
    
 
     
    
 
    
 
     
    
 Halo. I complicate the simple question again.   The output large segment HTML code can do this: 
 PHP code 
 $ar = Array (' demo ' = ' 111 ', ' test ' = ' 222 ');  
 $html = << 
  
 
  useful posts, helpful 
 
    
 