isset() gives wrong result

[kripper]

In this simplified test case, $t is never set, but isset($t) returns true.

<?php

function Test() {
    if(false) {
        $t = $dummy . 'garbage';
    }

    $b = isset($t);
    if($b) echo "BUG: Shouldn't be true";

    // HINT: Uncommenting this line changes the previous result (!)
    // if(isset($t)) echo "BUG: Same here";
}

Test();

[jakubmisek]

fixed, thank you!