problem using &&

Hi I am reading a username and password from a file. For the moment I am trying to test if the username and password are the same as user inputted username/password. My code snippet is as follows: if( $out[0][0] == $u && $out[0][1] == $p ) { $error = "Login successful!"; } else { $error = "Invalid username/password. Try again"; } $out[] is an array containing the file data. $u is the form username and $p the password. I echo both values once submitted. Even when they match I get invalid username/password message. If I just test if( $out[0][1] == $u ) it works. Has anyone any pointers on what I am doing wrong? Thanks Eoghan