Add update_chain.php and mysql_credentials.php.sample

Added send_code, get_chain_from_user functions. The get_chain_from_user generates a chain from a given user and returns an array in reverse sequential order.

mysql_credentials.php.sample

@@ -0,0 +1,8 @@
+<?php
+return array(
+  "servername" => "localhost",
+  "username" => "username_goes_here",
+  "password" => "password_goes_here",
+  "database" => "database_name_goes_here"
+);
+?>

update_chain.php

@@ -0,0 +1,56 @@
+<?php
+$bot_api = require('api_key.php');
+$chat_id = -1001180504638;
+$mysql = require('mysql_credentials.php');
+$conn = new mysqli($mysql['servername'], $mysql['username'], $mysql['password'], $mysql['database']);
+if ($conn->connect_error) {
+    die("Connection failed: " . $conn->connect_error);
+}
+
+function send_code($post_message, $reply=false) {
+  global $decoded;
+  global $bot_api;
+  global $chat_id;
+  $url = 'https://api.telegram.org/bot' . $bot_api . '/sendMessage';
+  $post_msg = array('chat_id' => $chat_id, 'text' => '```\n ' . $post_message . '```', 'parse_mode' => 'markdown' );
+  if ($reply != false) {
+    if ($reply === true){
+      $post_msg['reply_to_message_id'] = $decoded->{'message'}->{'message_id'};
+    }
+    else {
+      $post_msg['reply_to_message_id'] = $reply;
+    }
+  }
+  $options = array(
+    'http' => array(
+      'header' => "Content-type: application/x-www-form-urlencoded\r\n",
+      'method' => 'POST',
+      'content' => http_build_query($post_msg)
+    )
+  );
+  $context = stream_context_create($options);
+  $result = file_get_contents($url, false, $context);
+}
+
+function get_chain_from_user($user) {
+  global $conn;
+  $output = array($user);
+  $last_user_id = $user['user_id'];
+  while (true) {
+    $query = "SELECT user_id, username from users where follows = $last_user_id";
+    $result = $conn->query($query);
+    if ($result->num_rows > 0){
+      # Code executed if this isn't the last user
+      $details = $result->fetch_assoc();
+      array_push($output, $details );
+      $last_user_id = $details['user_id'];
+    }
+    else {
+      break;
+    }
+  }
+  return $output;
+}
+
+$conn->close();
+?>