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  1. or download this
    $short = "1234";

...

$result 3 = $short;
$result_3 .= "_001 unless ( index( $result_3, '_', 4) );
  2. or download this
    $result_4 = $short . ( index( $short, 4, 1 ) ) 
                     ? "" 
                     : "_001";