# \[PHP\] isset()

**URL:** <https://forum.kirupa.com/t/php-isset/226908>\
**Category:** programming\
**Created:** [May 25, 2007, 12:13am UTC](https://forum.kirupa.com/t/php-isset/226908 "2007-05-25T00:13:49Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![NeoDreamer](https://avatars.discourse-cdn.com/v4/letter/n/ccd318/32.png) [@NeoDreamer](https://forum.kirupa.com/u/NeoDreamer)\
**Post date:** [May 25, 2007, 12:13am UTC](https://forum.kirupa.com/t/php-isset/226908/1 "2007-05-25T00:13:49Z")

</div>

I don’t understand what’s the difference between:

```php

if($var)
   echo ('hello');

```

and

```php

if(isset($var))
   echo ('hello');

```