SplObjectStorage::offsetExists
(PHP 5 >= 5.3.0)
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
說明
public bool SplObjectStorage::offsetExists
( object
$object
)Checks whether an object exists in the storage.
Note:
SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains().
回傳值
Returns TRUE if the object exists in the storage,
and FALSE otherwise.
範例
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])
?>
上例的輸出類似於：
bool(true) bool(false)
參見
- 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
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