Module Can't Use Function Return Value In Write Context

[prestashop_newuser]

I am developing a custom module in prestashop. In that I have taken value inside a function like this

$fname = !empty(Tools::getValue('fname')) ? Tools::getValue('fname') : ' ';

but its showing error like this

Fatal error: Can't use function return value in write context

So can someone tell me why the error is here? How to solve this issue?

[NemoPS]

You can't use empty there, just use "Tools::getValue('fname') ?"

[prestashop_newuser]

You can't use empty there, just use "Tools::getValue('fname') ?"

I have to use condition there I mean when $fname is empty then the value should be just blank. Then how to use that?

[NemoPS]

The way I said  

Tools::getValue('fname') ? Tools::getValue('fname') : ' ';

[prestashop_newuser]

The way I said  

 

Tools::getValue('fname') ? Tools::getValue('fname') : ' ';

Hi,

Thanks for the answer. That worked. Thanks again