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)
Introducere
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.
Notă:
The class WeakReference is not to be confused with the class WeakRef of the Weakref extension.
WeakReferences cannot be serialized.
Sinopsisul clasei
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());
?>
Exemplul de mai sus va afișa ceva similar cu:
object(stdClass)#1 (0) {
}
NULL
Cuprins
- 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
