In certain cases, it is better to approach methods and properties of a class without the need to create an object out of the class. This can be achieved by defining the methods and properties of a class as static. Even though the use of static methods and properties is considered a bad practice, there are cases in which their use is quite handy and justified. Static methods can be called directly – without creating an instance / object of the class first.
<?php
class greeting {
public static function welcome() {
echo "Hello World!";
}
}
// Call static method
greeting::welcome();
?>
<?php
class greeting {
public static function welcome() {
echo "Hello World!";
}
public function __construct() {
self::welcome();
}
}
new greeting();
?>
<?php
class A {
public static function welcome() {
echo "Hello World!";
}
}
class B {
public function message() {
A::welcome();
}
}
$obj = new B();
echo $obj->message();
?>
<?php
class domain {
protected static function getWebsiteName() {
return "W3Schools.com";
}
}
class domainW3 extends domain {
public $websiteName;
public function __construct() {
$this->websiteName = parent::getWebsiteName();
}
}
$domainW3 = new domainW3;
echo $domainW3->websiteName;
?>
<?php
class pi {
public static $value = 3.14159;
}
// Get static property
echo pi::$value;
?>
