This code will run right out of the box, the issue is that it keeps hittign the "pvp" cconditional statement rather than the "account_name" statement... and clearly gw2action is "account_name"....
Use == when comparing values, one = is assignment and == is is used to compare the value of the variable on the left to the string in this case on the right.
So if($gw2action = "pvp") is actually assigning the value of pvp to $gw2action, it should be if($gw2action == "pvp") etc
You are using the assign operator inside an elseif condition. It always returns a true, I think. You have = the assignment operator, == the 'equal' comparison operator and === the 'identical' comparison operator.
this answer may help.