php - What is the usage of property in Codeigniter Model Class? -


i copied following code official codeigniter documentation.

class blog_model extends ci_model {          public $title;         public $content;         public $date;          public function get_last_ten_entries()         {                 $query = $this->db->get('entries', 10);                 return $query->result();         }          public function insert_entry()         {                 $this->title    = $_post['title']; // please read below note                 $this->content  = $_post['content'];                 $this->date     = time();                  $this->db->insert('entries', $this);         }          public function update_entry()         {                 $this->title    = $_post['title'];                 $this->content  = $_post['content'];                 $this->date     = time();                  $this->db->update('entries', $this, array('id' => $_post['id']));         }  }

please check line 3-5 : there 3 property called public $title; public $content;public $date;.

what usage of them?

i asked question because codes works fine when removing them.

i have tested removing there properties. still can call get_last_ten_entries(), insert_entry(), update_entry() function controller without issue.

these public variables

a public scope can make variable/function available anywhere, other classes , instances of object. (meaning once value assigned them, can access other class or instace)

so why can still work functions?

  • get_last_ten_entries(): functions not require variables
  • insert_entry() & update_entry(): assigning value them.

you'll error if request value instead of assigning value.

for example (assuming deleted public variables) , call function like

public function request_title(){     return $this->$title; }

without assigning values previously.

hope helps


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