[nycphp-talk] ${$variable}

Chris Snyder csnyder at
Wed Aug 27 16:40:30 EDT 2003

Okay folks, here's the scoop. Based on some extensive testing at

To test for an empty string, you have to test that it is both empty AND 
a string.

if ( is_string($$foo) && empty($$foo) ) do empty string stuff here

Otherwise $$foo could be 0 or not set at all. I humbly take back any 
misinfo I spread earlier, Michael.


Michael Southwell wrote:

> A line of code says this:
>   if (!(${$foo})) do something if the value is empty
> If $foo="bar" and $bar="something" then will ${$foo} evaluate to 
> "something"--which I assume is the purpose of the curly brackets?  But 
> it doesn't seem to work when the value is empty, though I would swear 
> it used to.  or maybe there is something with an empty value 
> evaluating true anyway, so I need to use =="" or ==="", or =='' or 
> ==='' (single quotation marks)?  Is this tricky, or am I just ignorant?
> Michael G. Southwell =================================
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