# Tracing a trace?

**URL:** <https://forum.kirupa.com/t/tracing-a-trace/311351>\
**Category:** flash\
**Created:** [July 3, 2010, 6:47pm UTC](https://forum.kirupa.com/t/tracing-a-trace/311351 "2010-07-03T18:47:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FreeHugs](https://avatars.discourse-cdn.com/v4/letter/f/59ef9b/32.png) [@FreeHugs](https://forum.kirupa.com/u/FreeHugs)\
**Post date:** [July 3, 2010, 6:47pm UTC](https://forum.kirupa.com/t/tracing-a-trace/311351/1 "2010-07-03T18:47:36Z")

</div>

Hey everyone,

Last night i found myself tracing a trace statement through a function by mistake but it lead to an interesting error!

if you try to run this -

```php
trace(trace("Hello"));

```

it outputs -

> Hello  
> undefined

Likewise, running this -

```php
trace(trace(trace("Hello")));

```

outputs -

> Hello  
> undefined  
> undefined

Obviously its not much of a problem since you’d never have to use it, but im interested in why it happens anyway :-/  
Anyone have any insight into this?