The WeakMap class
(PECL weakref >= 0.2.0)
简介
类摘要
/* 方法 */
}
范例
Example #1 Weakmap usage example
<?php
$wm = new WeakMap();
$o = new StdClass;
class A {
public function __destruct() {
echo "Dead!\n";
}
}
$wm[$o] = new A;
var_dump(count($wm));
echo "Unsetting..\n";
unset($o);
echo "Done\n";
var_dump(count($wm));
以上例程会输出：
int(1) Unsetting.. Dead! Done int(0)
Table of Contents
- WeakMap::__construct — Constructs a new map
- WeakMap::count — Counts the number of live entries in the map
- WeakMap::current — Returns the current value under iteration
- WeakMap::key — Returns the current key under iteration
- WeakMap::next — Advances to the next map element
- WeakMap::offsetExists — Checks whether a certain object is in the map
- WeakMap::offsetGet — Returns the value pointed to by a certain object
- WeakMap::offsetSet — Updates the map with a new key-value pair
- WeakMap::offsetUnset — Removes an entry from the map
- WeakMap::rewind — Rewinds the iterator to the beginning of the map
- WeakMap::valid — Returns whether the iterator is still on a valid map element
