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#this can go anywhere in your document (above the form element to which it applies)
srand(microtime() * 1000000000000);
$val_rnd = array_merge(range('a','z'), range('A','Z'), range(0,9));
$rnd = array_rand($val_rnd, 8);
for($i=0;$i<=7;$i++){
$val.= $val_rnd[$rnd[$i]];
}
?>
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