Example PHP singleton class

singleton.php

<?php

class Greeting
{
    // Hold an instance of the class
    private static $instance;
    private static $name;
 
    // The singleton method
    public static function singleton()
    {
        if (!isset(self::$instance)) {
            self::$instance = new Greeting;
        }
        return self::$instance;
    }
  
    public static function setName($name){
      self::$name = $name; 
    }
  
    public static function getName(){
      return self::$name;
    }
}
$greeting = Greeting::singleton();
$greeting->setName('Tony');
echo $greeting->getName();

?>