SplObjectStorage::offsetExists()

(PHP 5 >= 5.3.0, PHP 7)

Checks whether an object exists in the storage

说明

publicSplObjectStorage::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

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