Let’s start our thinking of the class with a simple PHP class example. In this example we want to print a variable value.
<?php
class SimpleClass
{
// property declaration
public $variable = 'This is state of an PHP object';
// method declaration
public function display_variable() {
echo $this->variable." Under PHP class Method";
}
}
?>
Save the code and run it. This program print nothing. It is important to remember that a class declaration only creates a template, it does not create the actual object. To print the variable value you need to create a instance of this class.
Creating an instance
You can create an instance using new operator. A class must be created before instantiating object. So the whole code is
<?php
class SimpleClass
{
// property declaration
public $variable = "This is state of an PHP object";
// method declaration
public function display_variable() {
echo $this->variable." Under PHP class Method";
}
}
$instance=new SimpleClass();
$instance->display_variable();
?>
Run this code and it will show This is state of an PHP object Under PHP class Method. In the display_variable method we use this keyword. It says that it is the variable of this class not other class.
