PHP Object Oriented Programming

PHP is an Object Oriented Programming language. The class keyword is used to declare a class, and the new keyword is used to create an object of that class.

<?PHP
class colleague
{
	private $name;
	private $age;
	public $city;

	public function colleague($n="",$a=""){
		$this->name = $n;
		$this->age = $a;
		$this->city = "unknown";
	}
	
    public function __construct() {}	
    public function __destruct() {}		
}
$obj = new colleague("john","25");
var_dump($obj); //show contents of object $obj
?>

The class properties with keyword public can be accessed, and those with keyword private cannot.

<?PHP
echo "$obj->city";  //print "unknown"
$obj->city = "New York";
echo "$obj->city";  //print "New York"
//Fatal error: Cannot access private property colleague::$name ...
$obj->name = "Mary";
echo "$obj->name"; 
?>

We can define a method to access the private property:

<?PHP
class colleague
{
	...
	public function setname($n=""){
		$this->name = $n;
	}
	public function getname(){
		echo "$this->name";
	}
}
$obj->setname("Mary");
$obj->getname();   //Print "Mary"
?>

Class inheritance:

<?PHP
class managercolleague extends colleague
{
	private $officenumber;
	public function setoffice($ofc){
		$this->officenumber = $ofc;
	}
	public function getoffice($ofc){
		echo "$this->officenumber";
	}
	//overwite colleague class construct function
	public function _construct(){
		parent::_construct();
		$this->officenumber = "000";
	}
}
$mobj = new managercolleague;
$mobj->setoffice("324");
$mobj->getoffice();  //Print 324
?>



:: PHP Tutorials Home ::
PHP String Functions
 • concatenation • echo
 • ereg • ereg_replace
 • explode • htmlspecialchars
 • preg_match • preg_replace
 • preg_split • print,sprintf
 • regular expr. • str_replace
 • strcmp • strpos
 • strrev • strrpos
 • strtr • substr
 • substr_replace
PHP Array Functions
 • array_diff • array_flip
 • array_intersect • array_key_exists
 • array_keys • array_merge
 • array_pop • array_push
 • array_rand • array_search
 • array_splice • array_unshift
 • array_values • asort & arsort
 • count • in_array
 • ksort • shuffle
 • sort
PHP Data Types
 • array • associative array
 • date & time • number
 • class, object • regular expression
 • string • variables
PHP Loop & Conditions
 • continue & break • for loop
 • foreach • if else
 • not equal • while
PHP File System Functions
 • copy • delete, unlink
 • dirname • download url
 • file_exists • is_file
 • mkdir • read file
 • scandir • write file
PHP Popular Topics
 • ajax • clone
 • comments • constants
 • cookie • database
 • defined • die
 • form validation • gd, draw images
 • global variables • header url
 • heredoc • mail
 • pass by reference • print
 • regular expr. • sessions
 • threads • xml parse
PHP Math Functions
 • abs • cos
 • exp • floor & ceil
 • fmod • log
 • max & min • pow
 • round • sin
 • sqrt • tan
endmemo.com © 2024  | Terms of Use | Privacy | Home