Validate at least one field to be filled in, Gravity forms

Question

I have been trying to create a custom validation hook for Gravity Forms plugin.

The validation checks that at least one field has been filled in from a set of fields.

Check out the code below, I just can't get it too work. I think it is something to do with the variables for the inputs, even if a field is filled in, the error still shows on each field?

add_filter( 'gform_field_validation_2', function ( $result, $value, $form, $field ) {

    if ( $field->type == 'number') {

        $a = rgar( $value, $field->id . '10' );
        $b = rgar( $value, $field->id . '12' );
        $c = rgar( $value, $field->id . '13' );
        $d = rgar( $value, $field->id . '14' );
        $e = rgar( $value, $field->id . '15' );
        $f = rgar( $value, $field->id . '17' );
        $g = rgar( $value, $field->id . '18' );
        $h = rgar( $value, $field->id . '20' );
        $i = rgar( $value, $field->id . '21' );
        $j = rgar( $value, $field->id . '22' );
        $k = rgar( $value, $field->id . '23' );


        if ( !empty($a) || !empty($b) || !empty($c) || !empty($d) || !empty($e) || !empty($f) || !empty($g) || !empty($h) || !empty($i) || !empty($j) || !empty($k) ) {
          $result['is_valid'] = true;
          $result['message'] ='';
        } else {
          $result['is_valid'] = false;
          $result['message']  = 'Please select a quantity of materials to order';
        }

    }

    return $result;
}, 10, 4 );

Answer 1

So heres a working version (Thanks for the gform_validation hint Francisco R) - Went down a slightly different route, but works perfectly, incase anyone interested in future!

add_filter( 'gform_validation_2', 'custom_validation_2' );
function custom_validation_2( $validation_result ) {

    // array of field IDs to be checked
    $field_ids = array (10, 12, 13, 14, 15, 17, 18, 20, 21, 23, 22);

    // get the form object from the validation result
    $form = $validation_result['form'];

    // counter to store how many fields have a value > 0 submitted
    $number_of_fields = 0;

    // loop through all the fields to be sure one has a value > 0
    foreach ( $field_ids as $input ) {
        // the rgpost string we are going to check
        $input_id = 'input_' . intval( $input );

        // the value that was submitted
        $input_value = rgpost ( $input_id );

        if ( $input_value > 0 ) {
            // if any field in the array has a value, we can just continue
            $number_of_fields++;
        } // end if
        else {
            // no value for this input, so continue without incrementing the counter
            continue;
        } // end else

    } // end foreach

    // check the $number_of_fields and if it is 0 return a validation error
    if ( $number_of_fields == 0 ){

        // set the form validation to false
        $validation_result['is_valid'] = false;

        // mark all the fields with a validation error
        foreach( $form['fields'] as &$field ) {

            // add a validation error to *all* the inputs if none were submitted > 0
            if ( in_array( $field->id, $field_ids ) ) {
                $field->failed_validation = true;
                $field->validation_message = 'Please select a quantity of materials to order from one or all of these fields.';
            } // end if
        } // end foreach

    } // end if

    // assign modified $form object back to the validation result
    $validation_result['form'] = $form;
    return $validation_result;

}