PHP Classes

Arsenal PHP Singleton Trait: Trait to make classes only have singleton objects

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Version License PHP version Categories
arsenal 1.1Freeware7Language, Design Patterns, PHP 7, Traits
Description 

Author

This package provides a trait to make classes only have singleton objects.

The trait provides a getter function that initializes an object on the first time a variable of the class is accessed with an instance of the target object that will act as a singleton object for the class.

A setter function will assign the variables of the target object that acts as singleton object for that class.

A constant array can be used to define how to map classes to target classes that will have objects acting as singletons.

Innovation Award
PHP Programming Innovation award nominee
January 2020
Number 4
Singleton is a common design pattern used by many developers to assure that only one object of a class is created even if the software tries to create objects of that class more than once.

This package provides an alternative approach to assure that only one object of a class is created by using PHP constant values to keep track of the objects that are created.

Manuel Lemos
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Name: wim niemans <contact>
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Nominee: 2x

Example

<?php

include_once 'arsenal.php';

Class
A
{
use
arsenal;
function
__construct() { echo 'Creating class A as ' . __CLASS__ . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}
Class
B
{
use
arsenal;
function
__construct() { echo 'Creating class B as ' . __CLASS__ . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}

Class
A1
{
function
__construct($obj) { echo 'Creating class A1 from ' . get_class($obj) . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}
Class
A2
{
function
__construct($obj) { echo 'Creating class A2 from ' . get_class($obj) . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}
Class
B1
{
function
__construct($obj) { echo 'Creating class B1 from ' . get_class($obj) . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}
Class
B2
{
function
__construct($obj) { echo 'Creating class B2 from ' . get_class($obj) . " \n"; }
function
sayHello() { echo 'Hello from class ' . __CLASS__ . " \n"; }
}

$a = new A;
$b = new B;
print_r($a);
print_r($b);

$a->a1->sayHello();
$a->a2->sayHello();
$a->b1->sayHello();
$a->b2->sayHello();
$b->b1->sayHello();
$b->b2->sayHello();

print_r($a);
print_r($b);

$a->a1->sayHello();
$a->a2->sayHello();
$a->b1->sayHello();
$a->b2->sayHello();
$b->b1->sayHello();
$b->b2->sayHello();

$b->a1->sayHello(); // throws error !!

/* Ouputs:
Creating class A as A
Creating class B as B
A Object
(
)
B Object
(
)
Creating class A1 from A
Hello from class A1
Creating class A2 from A
Hello from class A2
Creating class B1 from A
Hello from class B1
Creating class B2 from A
Hello from class B2
Creating class B1 from B
Hello from class B1
Creating class B2 from B
Hello from class B2
A Object
(
    [a1] => A1 Object
        (
        )

    [a2] => A2 Object
        (
        )

    [b1] => B1 Object
        (
        )

    [b2] => B2 Object
        (
        )

)
B Object
(
    [b1] => B1 Object
        (
        )

    [b2] => B2 Object
        (
        )

)
Hello from class A1
Hello from class A2
Hello from class B1
Hello from class B2
Hello from class B1
Hello from class B2

Fatal error: Uncaught Error: Call to a member function sayHello() on null in _test/demo.php:61
Stack trace:
#0 {main}
  thrown in _test/demo.php on line 61
 */
 
?>


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File Role Description
Plain text file arsenal.php Class singleton factory trait
Accessible without login Plain text file demo.php Example example script

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