Html elements in php

Let's take a look at the following code form2.phphtmlheadtitlegreetinseartylingtitleheadbodyformactionformprocess2. phpmethodposttabletrtdnametdtdinputtypetextnamenametdtrtrtdgreetingstdtdselectn

Let's take a look at the following code form2.php html head title greetins eartyling/title/head body form action = "formprocess2.php" method = "post" table tr td Name/td input type = "text" name = "name" // td/tr td Greetings/td select name = "gr

Let's take a look at the following code.

Form2.php

 greetins eartyling 
     
  
 
        
   
  
 
   
 
    
Name
 
    
 
   
 
   
 
    
Greetings
 
    
  Hello Hola Bonjour  
 
   
 
   
 
    
 
 
    
Display Debug info
 
   
 
   
 
    
  
 
   
 
  
  
 
 

Formprocess2.php

            Greeting earthing            
 Degut:';        print_r($_POST);        echo '

';}?>

Select the checkbox "Display Debug info" and click "submit" to Display the following content:

Bonjour, who!

Degut:Array ([name] => who and who [greeting] => Bonjour [debug] => on [submit] => Submit)

We can see that the value of the input element can be obtained using the $ _ POST ("name") function, not just a text box, but a single-statement checkbox and a drop-down list box select, note that here, if the checkbox value is "on", it is not true, and if we do not select the checkbox, use $ _ POST ("debug") to obtain the checkbox value, an error is returned, because the $ _ POST array does not contain this element.