PHP: How to serve customized content based on hundreds of user options?

I'm working on a long, long user form which will then lead to a customized display.

The final display has to be curated, paragraph by paragraph, to fit the user's input.

My first attempt was all if statements:

if($input_a && $input_b && $input_c !== $input_d) :

   echo result;

   if($input_a === 'example') :

      return false;

   endif;

   if($input_b !== 'example') :

      echo $input_c * $input_d;

   endif;

endif;

This got very messy, especially when I had to pass the results of this logic between JS and PHP.

My next attempt involved building a custom string for each user, based on some of the inputs ('x' means no input):

$code = array('x', 'x', 'x', 'x', 'x', 'x');

if($input_a && $input_b && $input_c !== $input_d) :

   $code[0] = 1;
   $code[1] = 1;

   if($input_a === 'example') :

      $code[2] = 1;

   else:

      $code[2] = 0;

   endif;

   if($input_b !== 'example') :

      $code[3] = 1;

   else :

      $code[3] = 0

   endif;

else :

     $code[0] = 0;
     $code[1] = 0;

endif;

So, in the above, the string would read something like '01x0'. Now I can assign the user this code, based on their input. Further along in the logic, I can check against this code to decide whether to serve some blocks of content or hide others.

If I want to check for a match on the first and fourth inputs, but don't care about the second and third, I can do this:

// 'x' is a placeholder for code items I don't care about
$result_option = '1xx1';

$pattern = '/[' . $code[0] . 'x][' . $code[1] . 'x][' . $code[2] . 'x]/';

if(preg_match($pattern, $result_option) :

   echo $result_option;

endif;

Ok, so this works.

But I feel like I'm reinventing the wheel here and eventually my code string is going to be a hundred characters long.

Are there better ways to serve customized content based on hundreds of user options that doesn't involve a hundred classes of nested if statements?