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You can use this filter to add your own custom validation for Car Demon vehicle options.

apply_filters( ‘cd_validate_option_filter’, $value, $name );

add_filter( 'cd_validate_option_filter', 'my_validation', 10, 2 );
function my_validation( $value, $name ) {

    if ('body_style' === $name ) {

         if ( 'pickup' === $value ) {

             $value = 'Truck';



    return $value;

The above example checks to see if the current field being validated is the “body_style”. If it is then it checks to see if the value is “pickup”. If it is then it changes the value to “Truck”.

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