Singleton.md

Singleton - special system trait, that adds to other classes realization of singleton pattern.

Methods Example

###[Up](#) Methods

Singleton defines next methods as protected and final:

• __construct
• __clone
• __wakeup

The only available public method is static method instance:

instance($check = false : bool)

If $check == true - then instead of object, boolean result will be returned: true if instance was already created, false otherwise.

If class need constructor - it is possible to add it by defining protected method construct() (as __construct is already defined as final in this trait).

###[Up](#) Example

<?php
class My_class {
    use \cs\Singleton;

    protected function constructor () {
        $this->five = 5;
    }
}

$object = My_class::instance();
$object->five; //5