bernhard-fischer.com - Object inheritance in PHP

.NET

Chrome

Delphi

PHP

Object inheritance in PHP

Written by Bernhard Fischer

Thursday, 01 March 2007

Object inheritance is a basic principle in object orientated programming languages. This notional PHP example inherits the object admin_user from regular_user and extends it.

The properties username and useraddress are read from a MySQL database mydb by quering the usertable with userid as parameter.

[click to collapse source code]

 
<?php
mysql_connect("localhost");
mysql_select_db("mydb");
 
/* we fetch 2 users from the database: users with userid 1 and 2 */
$user = new regular_user;
$user->getuser(1);
$user->showuser();
 
$user = new admin_user;
$user->getuser(2);
$user->showuser();
 
class regular_user{
    var $username;
    var $useraddress;
/* fill user properties */
    function getuser($id) {
        $result = mysql_query ("SELECT * FROM usertable WHERE userid=$id");
        if($row = mysql_fetch_array($result)) {
            $this->username = $row["username"];
            $this->useraddress = $row["useraddress"];
        } else {
            $this->username = "unknown";
            $this->useraddress = "unknown";
        }
    }
/* show user information */
    function showuser() {
        print("User info<br>");
        print("Username: ".$this->username."<br>");
        print("Address: ".$this->useraddress."<br>");
    }
}
 
/* inherited admin_user */
class admin_user extends regular_user {
    function edit_address() {
        print('<form method="post" action="processing.php">Address: <input type="text" name="useraddress"
            value="'.$this->useraddress.'"></form>');
    }
}
 
mysql_close();    
?>

Add as favourites (0) |

Quote this article on your site | Views: 2943

Be first to comment this article

Write Comment

Please keep the topic of messages relevant to the subject of the article. Personal verbal attacks will be deleted. Please don't use comments to plug your web site. Such material will be removed. Just ensure to Refresh your browser for a new security code to be displayed prior to clicking on the 'Send' button. Keep in mind that the above process only applies if you simply entered the wrong security code.
Name:
E-mail
Homepage
Title:
Comment:
	I wish to be contacted by email regarding additional comments

Last Updated ( Friday, 18 January 2008 )

Next >

[ Back ]