Equivolency?

PHP symbols

[feralo]

i just came across " $errors ¦= $error_name; " in a Script that i am working with, i thought that '¦' evaluated like 'or'.
If that is always the case, i don't understand this statement or how it will evaluate.
Can anyone give me some insight as to what '¦=' means?
(where you see ¦, it should be a vertical line character- i don't know why it is showing up broken here, but on my computer it is one vertical line)
Thank you

[coopster]

This forum breaks the pipe character, feralo.

That looks like binary arithmetic to me, a bitwise operator [php.net] in combination with an assignment operator [php.net].

[feralo]

Thank you very much.