ArrayObject
PHP Manual

ArrayObject::offsetExists

Returns whether the requested index exists

Description

public bool ArrayObject::offsetExists(mixed $key)

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)