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if statement not working correctly


cloudll
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I am using the following request on my site (index.php)

 

$compass = $_REQUEST['compass'];

 

I wanted to use an if statement to echo an error message if $compass was anything other than north,east,south or west. However the code im using is constantly displaying the error message even when /index.php?compass=north etc. Can anyone see what I have done wrong?

 

    if (($compass != "north") || ($compass != "east") || ($compass != "south") || ($compass != "west")) {

    echo '<strong>Stop cheating!</strong>';

}

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