[wp-hackers] "Plugin could not be activated because it triggered a fatal error." But what is the error?

[Jacob Santos]

I think the bigger fail is that the functions weren't namespaced. Naming 
a function or class simply "Widget" is asking for a fail.

Namespacing a function or class for PHP <5.3 is putting a name and then 
using an underscore. You'd put this for every function, class, variable 
you have.

Examples:

function myfunc_widget();

class Myname_Widget { }

Jacob Santos

PS This line does not have an error <?php echo $string ?>, because PHP 
will automatically terminate the line if it is missing a semicolon.