php - getting id from POST request -

i'm watching tutorial i'm watching tutorials cms oop - php

on control page :

public function update() {     if(isset($_post['updatearticle']))     {         $id = (int)$_post['id'];          //article data array         //varaibles         $title  = $_post['title']; //title         $content= $_post['content']; //content         $cat    = (int)$_post['cat'];          //validation           //data array          $data = array(             'title'   => $title,             'content' => $content,             'cid'     => $cat         );          //insert         if($this->articlesmodel->update($id,$data))         {             system::get('tpl')->assign('message','article updated');             system::get('tpl')->draw('success');         }         else         {             system::get('tpl')->assign('message','error updating article');             system::get('tpl')->draw('error');         }       }     else     {         $id = 0 ; //init         if(isset($_get['id']) && (int)$_get['id'] > 0)         {             $id = (int)$_get['id'];              //get article db             $article = $this->articlesmodel->get_by_id($id);              if(count($article)>0)             {                 //categories                 $cats = $this->articlescatsmodel->get();               //article found                 system::get('tpl')->assign($article);                 system::get('tpl')->assign('cats',$cats);                 system::get('tpl')->draw('updatearticle');              }             else             {                 //article not found                 system::get('tpl')->assign('message','article not found');                 system::get('tpl')->draw('error');              }          }         else         {             //no id             system::get('tpl')->assign('message','ivalid id');             system::get('tpl')->draw('error');         }     }   } 

he id post request how !!!

we take id url request

he did because of source

source of page:

<input type="hidden" name="id" value="5" /> <input type="submit" class="btn btn-info" name="updatearticle" value="update article" /> 

how can take id post request !!

and if changed request error

html form tag has method attribute. attribute defines whether content sent using post or get.

check method of <form method=?>.

read: http://www.w3schools.com/html/html_forms.asp