SplObjectStorage
PHP Manual

SplObjectStorage::offsetExists

(PHP 5 >= 5.3.0)

SplObjectStorage::offsetExists — Checks whether an object exists in the storage

说明

public bool SplObjectStorage::offsetExists ( object $object )

Checks whether an object exists in the storage.

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
PHP Manual