Got a working version longLatZip running, so I can get the longitude and...

Got a working version longLatZip running, so I can get the longitude and latitude of the central zip code.

API.php

 <?php
 include_once(dirname(__FILE__)."/queryPrep.php");
 
-//echo phpinfo();
-$res = resultQuery("select count(*) from zip",[]);
-echo $res->num_rows."<br/>";
-echo $res->fetch_row()[0]."<br/>";
-$res->close();
+
+/*
+returns the longitude and latitude of a zip code, 
+or false if the zipcode doesn't exist
+*/
+function longLatZip($zip){
+    $sql = "select * from zip where P = ?";
+    $param = Array(0 => $zip);
+
+    $result = resultQuery($sql, $param);
+    $retVal = False;
+    if($result->num_rows > 0){
+        $retVal = $result->fetch_assoc();
+        $result->close();
+    }
+    return $retVal;
+}
+
+/*
+calculating 
+https://stackoverflow.com/questions/24370975/find-distance-between-two-points-using-latitude-and-longitude-in-mysql/24372831#24372831
+*/
+function nearbyZips($zip, $maxDistance){
+    $zipArr = longLatZip($zip);
+    if(!$zipArr) return false;
+    $sql = "SELECT a.city AS from_city, b.city AS to_city, 
+    69.0 *
+     DEGREES(ACOS(COS(RADIANS(a.Latitude))
+          * COS(RADIANS(b.Latitude))
+          * COS(RADIANS(a.Longitude - b.Longitude))
+          + SIN(RADIANS(a.Latitude))
+          * SIN(RADIANS(b.Latitude)))) AS distance_in_mi
+   FROM city AS a
+   JOIN city AS b ON a.id <> b.id
+  WHERE a.city = 3 AND b.city = 7";
+  $params = [];
+
+}
+
+print_r(longLatZip(20194));
 ?>
 HELLO WORLD!
\ No newline at end of file

configNuts.php

@@ -4,7 +4,7 @@ if(is_dir(dirname(__FILE__)."/../zipAPI")){
 	//localhost
 	define("PHP_ROOT", $_SERVER["DOCUMENT_ROOT"]."/zipAPI");
 	define("HTML_ROOT", "/zipAPI");
-	define("URL", "http://localhost/nuts/nutrition/");
+	define("URL", "http://127.0.0.1/nuts/nutrition/");
 }elseif(is_dir(dirname(__FILE__)."/../../public_html")){
 	//SMS
 	define("PHP_ROOT", $_SERVER["DOCUMENT_ROOT"]);