Php/docs/splobjectstorage.offsetexists
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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 $object
) : bool
Checks whether an object exists in the storage.
Note:
SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains().
参数
object- The object to look for.
返回值
Returns true if the object exists in the storage,
and false otherwise.
范例
Example #1 SplObjectStorage::offsetExists() example
<?php$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
