Quickscan with redirect to resultpage (using Gravity Forms)

custom.php

/**
 * We calculate the input value of give form inputs and change the redirect url afterwards
 *
 * @param array $form, array $lead
 * 
 * @return array $confirmation[ 'redirect' ]
 **/
 
add_filter( 'gform_confirmation', 'custom_confirmation', 10, 4 );
 
function custom_confirmation($confirmation, $form, $lead, $ajax){
    
    // replace the 'id' value with the ID of your used Gravity Form
    if( $form[ 'id' ] == '2' ){
 
    	$count = 0;
    	$total_count = 0;
 
    	foreach( $lead as $key => $value ):
 
    		if( is_numeric( $key ) ):
          
       // replace 'Ja' with the value that needs to be counted (checkbox)
    			if( 'Ja' == $value ):
    				$count++;
    			endif;
 
    			$total_count++;
 
    		endif;
 
    	endforeach;
 
    	$percentage = ( $count / $total_count ) * 100;
      
      // if more than 40% of the questions is answered with the needed answer, then redirect to... (replace percentage with you own value)
    	if( $percentage >= 40 ):
 
        // redirect to the page selected in the given ACF Option
    		$confirmation = array( 'redirect' => get_field('option1', 'option') );
 
    	else:
    	
        // redirect to the page selected in the given ACF Option
    		$confirmation = array( 'redirect' => get_field('option1', 'option') );
 
    	endif;
 
    }
 
    return $confirmation;
}

default.php

if( function_exists('acf_add_options_sub_page') ){
  
  // Add new ACF Options subpage where you can select the pages for the redirects
	acf_add_options_sub_page( 'Quickscan' ); 
	 
}