Weakref::__construct
(PECL weakref >= 0.1.0)
Weakref::__construct — Constructs a new weak reference
Description
public Weakref::__construct
([ object
$object
] )Constructs a new weak reference.
Parameters
-
object -
The object to reference.
Return Values
No value is returned.
Examples
Example #1 Weakref::__construct() example
<?php
class MyClass {
public function __destruct() {
echo "Destroying object!\n";
}
}
$o1 = new MyClass;
$r1 = new Weakref($o1);
if ($r1->valid()) {
echo "Object still exists!\n";
var_dump($r1->get());
} else {
echo "Object is dead!\n";
}
unset($o1);
if ($r1->valid()) {
echo "Object still exists!\n";
var_dump($r1->get());
} else {
echo "Object is dead!\n";
}
?>
The above example will output:
Object still exists!
object(MyClass)#1 (0) {
}
Destroying object!
Object is dead!
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Изменение поведения PHP
- Weak References
- Функция Weakref::acquire() - Acquires a strong reference on that object
- Функция Weakref::__construct() - Constructs a new weak reference
- Функция Weakref::get() - Returns the object pointed to by the weak reference
- Функция Weakref::release() - Releases a previously acquired reference
- Функция Weakref::valid() - Checks whether the object referenced still exists
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