PHP Singleton Trait

SingletonTrait.php

<?php

/**
 * Singleton Trait.
 * 
 * Example:
 * 
 * class MyClass 
 * {
 *     use SingletonTrait;
 * }
 * 
 * $my = MyClass::getInstance();
 */
trait SingletonTrait 
{
    private static $_instance;
    
    public static function getInstance()
    {
        if (!$this->_instance) {
            $this->_instance = new static();
        }
        return $this->_instance;
    }
}