Strstr requires an array as the second argument?
I am calling code like

    strstr($somevars['thisvar'], "abc")

Where `$somevars['thisvar']` contains a string.

And it's giving me 

    Warning:  strtr() [function.strtr]: The second argument is not an array

Why?
Strstr requires an array as the second argument?
===

I am calling code like

    strstr($somevars['thisvar'], "abc")

Where `$somevars['thisvar']` contains a string.

And it's giving me 

    Warning:  strtr() [function.strtr]: The second argument is not an array

Why?