Consistency for conditions

[peter279k]

As title, it seems that there're two different conditions on this src folder.

One is normal condition statement and another is Yoda condition statement.

To be consistency, I think it should use one of condition on these PHP codes on src folder.

@sebastianfeldmann, which conditions do you prefer?

Once this issue is accepted, I can be happy to work on this :).

[sebastianfeldmann]

Naturally I do normal ones so maybe use those :)