Add query caching

index.php

@@ -78,10 +78,15 @@ if (empty($_REQUEST["zip"])) {
     exit(json_encode(["status" => "ERROR", "message" => "Empty ZIP"]));
 }
 
-if (preg_match("/[0-9]{5}-?[0-9]{4}", $_REQUEST["zip"])) {
+if (preg_match("/[0-9]{5}-?[0-9]{4}/", $_REQUEST["zip"])) {
     $_REQUEST["zip"] = substr($_REQUEST["zip"], 0, 5);
 }
 
+$cacheresp = $memcache->get($_REQUEST["zip"] . "|" . $_REQUEST["address"]);
+if ($cacheresp !== false) {
+    exit($cacheresp);
+}
+
 $addressparts = explode(" ", $_REQUEST["address"], 2);
 
 if (count($addressparts) < 1 || !is_numeric($addressparts[0])) {
@@ -128,4 +133,8 @@ for ($i = 0; $i < count($results); $i++) {
     }
 }
 
-exit(json_encode(["status" => "OK", "results" => $finalresults]));
+$resultjson = json_encode(["status" => "OK", "results" => $finalresults]);
+
+$memcache->set($_REQUEST["zip"] . "|" . $_REQUEST["address"], $resultjson);
+
+exit($resultjson);