Variable 'x' is not used

Codenizer can report this in either of two scenarios:

//...
function write_xy($x, $y) {     // Variable 'x' is not used
    echo $y;
}
//...

$x is declared to be parameter of function, but it is not used inside function body.

//...
function test($arg) {
    $x = strlen($arg);          // Variable 'x' is not used

    echo ($arg);
}
//...

$x has some value assigned, but $x was not used after that.

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