Use of uninitialized value in array element at equal.txt line 16.

You can get rid of this warning by initializing $ff to zero.

$st=$db->prepare("SELECT relcode FROM bigone WHERE email = $zz ");
$st->execute();
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Don't ever interpolate data into your SQL strings, you'll only have problems with quoting. Use placeholders instead:

$st=$db->prepare("SELECT relcode FROM bigone WHERE email = ?");
$st->execute($zz);
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Much safer!