SplObjectStorage::offsetExists
(PHP 5 >= 5.3.0, PHP 7)
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
说明
public
SplObjectStorage::offsetExists (
object
$object
) :
bool
Checks whether an object exists in the storage.
Note:
SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains().
返回值
Returns TRUE
if the object exists in the storage, and FALSE
otherwise.
范例
Example #1 SplObjectStorage::offsetExists() example
<?php
$s = new SplObjectStorage;
$o1 = new StdClass;
$o2 = new StdClass;
$s->attach($o1);
var_dump($s->offsetExists($o1)); // Similar to isset($s[$o1])
var_dump($s->offsetExists($o2)); // Similar to isset($s[$o2])
?>
以上例程的输出类似于:
bool(true) bool(false)
参见
- SplObjectStorage::offsetSet() - Associates data to an object in the storage
- SplObjectStorage::offsetGet() - Returns the data associated with an object
- SplObjectStorage::offsetUnset() - Removes an object from the storage