[asterisk-users] AEL: how to check if variable is defined

[Klaus Darilion]

Thanks Dave, Philipp and Richard!

klaus

Richard Lyman wrote:
> Philipp Kempgen wrote:
>> Richard Lyman schrieb:
>>   
>>> Philipp Kempgen wrote:
>>>     
>>   
>>>> But I guess it wouldn't hurt to add a DEFINED() function to
>>>> Asterisk.
>>>>
>>>> if (DEFINED(myvariable)) {
>>>>     // ...
>>>> }
>>>>   
>>>>       
>>> Isn't that what ISNULL is for?
>>>     
>> No. ISNULL() works on values not on variables.
>>
>> But Dave Fullerton found EXISTS():
>> http://lists.digium.com/pipermail/asterisk-users/2008-December/224059.html
>>
>>
>>    Philipp Kempgen
>>
>>   
>                 if (${ISNULL(${CAMPAIGN})}) {
>                         Set(CAMPAIGN=INBOUND);
>                 };
> 
> This is how i use it.
> 
> 
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