API-work for kassa.neuf.no

* Starts /api/register.php as primary endpoint for kassa
* Started work on simple card number updates in cardnumber.php
* Reworded sms/register.php
* Update README with markdown syntax

api/api_functions.php

@@ -1,15 +1,26 @@
 <?php
-set_include_path("../includes/");
+set_include_path("../includes/".PATH_SEPARATOR.get_include_path());
 require_once("../includes/DB.php");
 require_once("../inside/credentials.php");
 
 
 /* Set HTTP response code */
-function set_response_code($code) {
-    if(!is_int($code)) {
-        return false;
+if( !function_exists('set_response_code') ) {
+    function set_response_code($code)
+    {
+        if (!is_int($code)) {
+            return false;
+        }
+        header('X-Ignore-This: something', true, $code);
     }
-    header('X-Ignore-This: something', true, $code);
+}
+
+
+function return_json_response($data, $response_code=200) {
+    if($response_code != 200) {
+        set_response_code($response_code);
+    }
+    die(json_encode($data));
 }
 
 
@@ -40,24 +51,29 @@ function get_db_connection($fetch_mode=NULL, $options=NULL) {
 }
 
 
-function clean_phonenumber($pn) {
-    $pn = preg_replace('/[^0-9\+]/', '', $pn); // remove everything except valid chars
-    $pn = preg_replace('/^00/','+', $pn); // replace starting 00 with +
-    // norwegian phone numbers
-    if( strlen($pn) === 8 && ($pn[0] === "4" || $pn[0] === "9") ) {
-        $pn = "+47".$pn;
+if( !function_exists('clean_phonenumber') ) {
+    function clean_phonenumber($pn) {
+        $pn = preg_replace('/[^0-9\+]/', '', $pn); // remove everything except valid chars
+        $pn = preg_replace('/^00/', '+', $pn); // replace starting 00 with +
+        // norwegian phone numbers
+        if (strlen($pn) === 8 && ($pn[0] === "4" || $pn[0] === "9")) {
+            $pn = "+47" . $pn;
+        }
+        // ...without +
+        if (strlen($pn) === 10 && $pn[0] === "4" && $pn[1] === "7" && ($pn[2] === "4" || $pn[2] === "9")) {
+            $pn = "+" . $pn;
+        }
+
+        return $pn;
     }
-    // ...without +
-    if( strlen($pn) === 10 && $pn[0] === "4" && $pn[1] === "7" && ($pn[2] === "4" || $pn[2] === "9") ) {
-        $pn = "+".$pn;
-    }
-    return $pn;
 }
 
 
-// E.164
-function valid_phonenumber($phone) {
-    return preg_match('/^\+?\d{8,15}$/i', $phone);
+if( !function_exists('valid_phonenumber') ) {
+    // E.164
+    function valid_phonenumber($phone) {
+        return preg_match('/^\+?\d{8,15}$/i', $phone);
+    }
 }