# Get the key in an array

**URL:** <https://forum.kirupa.com/t/get-the-key-in-an-array/152115>\
**Category:** flash\
**Created:** [June 21, 2005, 11:44am UTC](https://forum.kirupa.com/t/get-the-key-in-an-array/152115 "2005-06-21T11:44:16Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Idunno](https://avatars.discourse-cdn.com/v4/letter/i/e8c25b/32.png) [@Idunno](https://forum.kirupa.com/u/Idunno)\
**Post date:** [June 21, 2005, 11:44am UTC](https://forum.kirupa.com/t/get-the-key-in-an-array/152115/1 "2005-06-21T11:44:16Z")

</div>

Hello,

I have an array:

```php

Array[1]=21
Array[2]=15
Array[3]=18

```

After sorting this array it looks like

```php

Array[2]=15
Array[3]=18
Array[1]=21

```

I want to get the id of the first element in this array -\> 2

How can I do this? :book: