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): bool

Checks 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