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  1. or download this
    if ( defined( $q->param( "myinput" ) ) ) {
    print( $q->param( "myinput" ) );
}
  2. or download this
    my $value = $q->param( "myinput" );
print( $value ) if ( $value );
  3. or download this
    my $value = $q->param( "myinput" );
print( $value ) if ( defined( $value ) );