unexpected T_CONCAT_EQUAL [closed]

Question

I'm getting an unexpected T_CONCAT_EQUAL error on a line of the following form:

$arg1 .= "arg2".$arg3."arg4";

I'm using PHP5. I could simply go an do the following:

$arg1 = $arg1."arg2".$arg3."arg4";

but I'd like to know whats going wrong in the first place. Any ideas?

Thanks, sweeney

Answer 1

This would happen when $arg1 is undefined (doesn't have a value, was never set.)

Answer 2

So the most accurate reason is that the above posted line of code:

$arg1 .= "arg2".$arg3."arg4";

was actually as follows in my source:

arg1 .= "arg2".$arg3."arg4";

The $ was missing from arg1. I dont know why the interpreter did not catch that first, but whatever. Thanks for the input Jeremy and Bailey - it lead me right to the problem.

Answer 3

sounds like you forgot a semicolon on the line above this one.