Redefinition of symbol 'x'

Code sample:

//...
function do_something($x) {
    //...
}
//...
function do_something($x, $y) { // Redefinition of symbol 'do_something'
    //...
}
//...

Symbol 'x' is already defined (or declared). Codenizer will usually give you 2 line error message with 2nd line containing line number of previous definition.