php - Making IF ELSE statement with combinations of choice -

currently i'm making application suggest car suits users' preferences based on selection. i'd skip html form choices follow:

type: mpv, suv, sedan
passengers: 5, 7
engine: gasoline, diesel
budget: low, medium, high, luxury

here i'm trying make combination because want every single choice counts. therefore i've done far:

if (isset($_post['submit']) {  $type = $_post['type'];  $passengers = $_post['passengers'];  $engine = $_post['engine'];  $budget = $_post['budget'];   if ($type == 'mpv' && $passengers == 5 && $engine == 'gasoline' && $budget == 'low')  {    // execute function here  }   else if ($type == 'mpv' && $passengers == 7 && $engine == 'gasoline' && $budget == 'low')  {    // execute function here  }   else if ($type == 'mpv' && $passengers == 5 && $engine == 'diesel' && $budget == 'low')  {    // execute function here  }    // , goes on , on...... 

i know problem have keep making if/elseif function until list every single possible combination. there better way this? need every single possible combination because there additional calculations done in custom function.

here custom function:

public function calculatedetails($displacement_bottom, $displacement_top, $price_bottom, $price_top, $clearance) {     $stmt = $connect->prepare("select id, brand, name cars                                 type = '$type'                                 , displacement between '$displacement_bottom' , '$displacement_top'                                 , price between '$price_bottom' , '$price_top'                                 , clearance = '$clearance'                                 , passengers = '$passengers'                                 , engine = '$engine'                                 limit 3");     $stmt->execute();     while ($row = $stmt->fetch())     {         $result = echo htmlspecialchars($row['brand'])." ".htmlspecialchars($row['name']);     }     return $result; } 

so can this

if ($type == 'mpv' && $passengers == 5 && $engine == 'gasoline' && $budget == 'low') {     $suggestion = calculatedetails(1500, 2000, 100, 150, 'medium');     echo $suggestion; } else if ($type == 'mpv' && $passengers = 7 && $engine == 'gasoline' && $budget = 'low') {     // continue on , on... } 

since couldn't find way simplify if/else "loop" (and started thinking giving :( ), came few new functions

public function typedetails($type) {     if ($type == 'mpv')     {         $detailed_type = echo "1500 , 2000";      }     else if ($type == 'suv')     {         $detailed_type = echo "2000 , 3500";     }     else     {         $detailed_type = echo "2000 , 3000";     }     return $detailed_type; }  public function budgetdetails($budget) {     if ($budget == 'low')     {         $detailed_price = echo "100 , 150";     }     else if ($type == 'medium')     {         $detailed_price = echo "150 , 250";     }     else if ($type == 'high')     {         $detailed_price = echo "250 , 450";     }     else     {         $detailed_price = echo "450 , 800";     }     return $detailed_price; }  public function groundclearance($type) {     if ($type == 'mpv')     {         $ground_clearance = "medium";      }     else if ($type == 'suv')     {         $ground_clearance = "high";     }     else     {         $ground_clearance = "low";     }     return $ground_clearance; } 

in hope able instead

$type = $_post['type']; $budget = $_post['budget'];  $displacement = typedetails($type); $price = budgetdetails($budget);  // same function simplified clause $suggestion = calculatedetails($displacement, $price, $clearance); echo $suggestion; 

i'm tired continue today, guys came few more ideas. appreciate replies , comments given here. might not in php, therefore want learn how make things simpler

there not can here. alternative option, may create kind of matrix models using multi level array:

$matrix = [     'mpv' => [         'diesel' => [             5 => [                 'low' => function() { ... },                 'medium' => function() { ... },             ],         ],         'gasoline' => [ ... ],     ],     'suv' => [ ... ], ];  if (isset($matrix[$type][$engine][$passengers][$budget])) {     $matrix[$type][$engine][$passengers][$budget](); } 

you may reuse functions if don't differ or set special constants instead of functions passed single custom method. depends on actual functionality have each combination.