SplObjectStorage::offsetExists
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
说明
public SplObjectStorage::offsetExists(object
$object): boolChecks whether an object exists in the storage.
注意:
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
示例 #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
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备份地址：http://www.lvesu.com/blog/php/splobjectstorage.offsetexists.php