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<?php
function sort_array_using_array( $a, $b ) {
    $order = array(
            __( 'First', 'popup-maker' ),
            __( 'Second', 'popup-maker' ),
            __( 'Third', 'popup-maker' ),
    );

    $ai = in_array( $a, $order ) ? array_search ( $a, $order ) : count( $order ) + 1;
    $bi = in_array( $b, $order ) ? array_search ( $b, $order ) : count( $order ) + 1;

    if ( $ai == $bi ) {
        return 0;
    }

    // Compare their positions in line.
    return $ai > $bi ? 1 : -1;
}

$test = array(
  'Tenth' => 10,
  'Eighth' => 8,
  'First' => 1,
  'Fourth' => 4,
  'Second' => 2,
  'Fifth' => 5,
  'Third' => 3,
);
uksort( $test, 'sort_array_using_array' );
print( $test );
?>
Results:

[
  'First' => 1,
  'Second' => 2,
  'Third' => 3,
  'Tenth' => 10,
  'Eighth' => 8,
  'Fourth' => 4,
  'Fifth' => 5,
]