Add webhook.

Added webhook.php that takes input and adds it to respective field of the id.

webhook.php

@@ -0,0 +1,76 @@
+<?php
+// MySQL credentials
+$mysql = require('mysql_credentials.php');
+
+// Get JSON from post, store it and decode it.
+$var = file_get_contents('php://input');
+$json = fopen('json', "w");
+fwrite($json, $var);
+fclose($json);
+$decoded = json_decode($var);
+
+// Store the sender ID
+$sender_id = $decoded->{"message"}->{"from"}->{"id"};
+$text = strtolower($decoded->{"message"}->{"text"});
+
+$alphabet = array(
+  "a" => 0,
+  "b" => 0,
+  "c" => 0,
+  "d" => 0,
+  "e" => 0,
+  "f" => 0,
+  "g" => 0,
+  "h" => 0,
+  "i" => 0,
+  "j" => 0,
+  "k" => 0,
+  "l" => 0,
+  "m" => 0,
+  "n" => 0,
+  "o" => 0,
+  "p" => 0,
+  "q" => 0,
+  "r" => 0,
+  "s" => 0,
+  "t" => 0,
+  "u" => 0,
+  "v" => 0,
+  "w" => 0,
+  "x" => 0,
+  "y" => 0,
+  "z" => 0
+);
+$conn = new mysqli($mysql['servername'], $mysql['username'], $mysql['password'], $mysql['dbname']);
+if ($conn->connect_error) {
+    die("Connection failed: " . $conn->connect_error);
+} 
+
+$query = "SELECT * FROM data WHERE id = $sender_id ;";
+$result = $conn->query($query);
+if ($result->num_rows > 0) {
+  $alphabet = $result->fetch_assoc();
+}
+
+$new_alphabet = count_chars($text, 0);
+
+// ASCII range for a-z 97-122
+for ($i = 97; $i <= 122 ; $i++) {
+  $alphabet[chr($i)] += $new_alphabet[$i];
+}
+
+if ($result->num_rows > 0) {
+  $query = "DELETE FROM " . $mysql['dbname'] . " WHERE id = $sender_id ;";
+  $conn->query($query);
+}
+
+$query = "INSERT INTO data values( $sender_id";
+
+foreach ($alphabet as $letter=>$num){
+  $query .= "," . $num;
+}
+
+$query .= ");";
+
+$conn->query($query);
+?>