Returns whether the requested index exists

# ArrayObject::offsetExists

(PHP 5, PHP 7, PHP 8)

ArrayObject::offsetExists — Returns whether the requested index exists

### Description

public ArrayObject::offsetExists(mixed `$key`): bool

### Parameters

`key`

  The index being checked.

### Return Values

`true` if the requested index exists, otherwise `false`

### Examples

Example #1 ArrayObject::offsetExists() example

`<?php
$arrayobj = new ArrayObject(array('zero', 'one', 'example'=>'e.g.'));
var_dump($arrayobj->offsetExists(1));
var_dump($arrayobj->offsetExists('example'));
var_dump($arrayobj->offsetExists('notfound'));
?>`

The above example will output:

    bool(true)
    bool(true)
    bool(false)

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