Returns whether the requested index exists

ArrayObject::offsetExists

(PHP 5, PHP 7, PHP 8)

ArrayObject::offsetExists — Returns whether the requested index exists

說明

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

參數

key

The index being checked.

返回值

true if the requested index exists, otherwise false

範例

示例 #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'));
?>

以上例程會輸出:

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

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