The __construct() method in CodeIgniter's CI_Model is a constructor method that is called automatically when a new model object is created. This method initializes the various properties of the model and sets up the necessary database connection. It can be used to set up any additional logic that the model needs to function properly.
Code examples:
Example 1:
In this example, we are creating a new model object called "User_model" and initializing some properties using the __construct() method:
class User_model extends CI_Model { public function __construct() { parent::__construct(); $this->load->database(); $this->load->library('session'); } }
In this example, we are calling the parent class's __construct() method, which sets up the CI_Model class. We are then loading the database library and the session library so that they are available to the model.
Example 2:
In this example, we are passing some arguments to the __construct() method in order to set up the model with some custom parameters:
class User_model extends CI_Model { public function __construct($db_name, $session_name) { parent::__construct(); $db_conf['hostname'] = 'localhost'; $db_conf['username'] = 'root'; $db_conf['password'] = ''; $db_conf['database'] = $db_name; $this->load->database($db_conf); $this->load->library('session'); $this->session->set_userdata('name', $session_name); } }
In this example, we are passing two arguments to the __construct() method - a database name and a session name. We use these arguments to set up the database configuration array, load the session library, and set a session variable.
Package library:
The package library used in these code examples is CodeIgniter. CodeIgniter is a popular PHP web application framework that provides developers with a set of tools to build robust web applications quickly and easily. The CI_Model class is a core part of the framework and provides a convenient way to interact with databases and other data sources.
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