You might consider to use WeakReference in your Container class. Don't forget to create the object into a variable and pass the variable to WeakReference::create() otherwise you going to ->get() null.
Consider as wrong solution, which returns null
<?php
/**
* @return App
*/
public static function app() : App
{
if (!static::$app) {
static::$app = WeakReference::create(new App());
}
return static::$app->get();
}
?>
Consider as GOOD solution, which returns App instance
<?php
/**
* @return App
*/
public static function app() : App
{
if (!static::$app) {
$app = new App();
static::$app = WeakReference::create($app);
}
return static::$app->get();
}
?>
The WeakReference class
(PHP 7 >= 7.4.0, PHP 8)
Introduzione
Weak references allow the programmer to retain a reference to an object which does not prevent the object from being destroyed. They are useful for implementing cache like structures.
WeakReferences cannot be serialized.
Sommario della classe
WeakReference Examples
Example #1 Basic WeakReference Usage
<?php
$obj = new stdClass;
$weakref = WeakReference::create($obj);
var_dump($weakref->get());
unset($obj);
var_dump($weakref->get());
?>Il precedente esempio visualizzerà qualcosa simile a:
object(stdClass)#1 (0) {
}
NULL
Indice dei contenuti
- WeakReference::__construct — Constructor that disallows instantiation
- WeakReference::create — Create a new weak reference
- WeakReference::get — Get a weakly referenced Object
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User Contributed Notes 1 note
Sandor Toth ¶
4 years ago
