Shopify backend intern test. Hosted: http://104.236.141.69/shopify/shopify.php

shopify.php

<?php
     $data = get_data();
     $response = array();
     $response["invalid_customers"] = validate($data["validations"], $data["customers"]);

     echo json_encode($response);



     function validate($rules, $entries){
          $errors = array();

          foreach($entries as $entry){

               while ($rule = current($rules)) {
                    //required fields
                    if($rule[key($rule)]["required"] && gettype($entry[key($rule)]) == "NULL"){
                         add_error($entry, $errors, key($rule));
                    }

                    //type
                    if(array_key_exists("type", $rule[key($rule)])){
                         switch ($rule[key($rule)]["type"]) {
                              case "number":
                                   if(gettype($entry[key($rule)]) != "integer" && gettype($entry[key($rule)]) != "double"){
                                        add_error($entry, $errors, key($rule));
                                   }
                                   break;
                              case "boolean":
                                   if(gettype($entry[key($rule)]) != "boolean"){
                                        add_error($entry, $errors, key($rule));
                                   }
                                   break;
                              case "string":
                                   if(gettype($entry[key($rule)]) != "string"){
                                        add_error($entry, $errors, key($rule));
                                   }
                                   break;
                         }
                    }

                    //length
                    if(array_key_exists("length", $rule[key($rule)])){
                         if(array_key_exists("min", $rule[key($rule)]["length"]) && strlen($entry[key($rule)]) < $rule[key($rule)]["length"]["min"]){
                              add_error($entry, $errors, key($rule));
                         }

                         if(array_key_exists("max", $rule[key($rule)]["length"]) && strlen($entry[key($rule)]) > $rule[key($rule)]["length"]["max"]){
                              add_error($entry, $errors, key($rule));
                         }
                    }

                    next($rules);
               }

               reset($rules);
          }

          return $errors;
     }

     function add_error($entry, &$errors, $reason){
          foreach($errors as &$e){
               if($e["id"] == $entry["id"]){
                    if(!in_array($reason, $e["invalid_fields"])){
                         array_push($e["invalid_fields"], $reason);
                    }
                    return;
               }
          }

          $error = array();
          $error["id"] = $entry["id"];
          $error["invalid_fields"] = array($reason);
          array_push($errors, $error);
     }

     function get_data($data = array(), $page = 1){
          $json = file_get_contents("https://backend-challenge-winter-2017.herokuapp.com/customers.json?page=" . $page);
          $json = json_decode($json, true);

          if(count($data) == 0){
               $data["validations"] = $json["validations"];
               $data["customers"] = $json["customers"];
          }else{
               $data["customers"] = array_merge($data["customers"], $json["customers"]);
          }

          if(end($data["customers"])["id"] == $json["pagination"]["total"]){
               return $data;
          }else{
               return get_data($data, $page + 1);
          }
     }
?>