diff --git a/index.php b/index.php
new file mode 100644
index 0000000..36b89ab
--- /dev/null
+++ b/index.php
@@ -0,0 +1,130 @@
+<?php
+class ShortLink {
+    /**
+     * Please enter the correct DB information.
+     * @var string
+     */
+    private $db_ip = '127.0.0.1';
+    private $db_id = 'hakase';
+    private $db_pw = 'hakase';
+    private $db_name = 'hakase';
+
+    /**
+     * mysqli Connect data.
+     * @var class
+     */
+    private $mysqli;
+
+    /**
+     * Connect DB
+     */
+    public function __construct() {
+        $this->mysqli = @new mysqli($this->db_ip, $this->db_id, $this->db_pw, $this->db_name);
+        if ($this->mysqli->connect_errno) die('DB Connect ERROR!!!');
+    }
+    /**
+     * Generate a random string, using a cryptographically secure
+     * pseudorandom number generator (random_int)
+     *
+     * For PHP 7, random_int is a PHP core function
+     * For PHP 5.x, depends on https://github.com/paragonie/random_compat
+     *
+     * @param int    $length      How many characters do we want?
+     * @param string $keyspace    A string of all possible characters
+     *                            to select from
+     * @return string
+     */
+    private function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
+    {
+        $pieces = [];
+        $max = mb_strlen($keyspace, '8bit') - 1;
+        for ($i = 0; $i < $length; ++$i) {
+            $pieces []= $keyspace[random_int(0, $max)];
+        }
+        return implode('', $pieces);
+    }
+    /**
+     * DB Select Function
+     * @param string $text  Short URL data
+     * @param string $url   URL data (optional)
+     * @return array Output DB data
+     */
+    private function Select($text, $url = NULL) {
+        if (!is_null($text)) $text = htmlspecialchars($text);
+        if (!is_null($url)) $url = htmlspecialchars($url);
+        return $this->mysqli->query('select randstr, url from shortlink where url = \'' . $url . '\' or randstr = \'' . $text . '\';')->fetch_array(MYSQLI_ASSOC);
+    }
+    /**
+     * Create a short URL address.
+     * @param  string $url  URL data
+     * @param  string $text Short URL data (optional)
+     * @return array/null   When a valid value comes in,
+     *                      it returns the source address and the short URL.
+     *                      If it is not a valid value, it returns NULL.
+     */
+    public function Make($url, $text = NULL) {
+        if (!is_NULL($text) &&
+            (strlen($text) > 16 || strlen($text < 3))) return NULL;
+        $select = $this->Select($text, $url);
+        $url = htmlspecialchars($url);
+        if ($text === NULL)
+            $text = $this->random_str(rand(3, 16));
+        if (!is_null($select['url']) &&
+            $url === $select['url']) {
+            return array('randstr' => $select['randstr'], 'url' => $select['url']);
+        }
+        if (!is_null($select['randstr']) &&
+            $select['randstr'] === $text &&
+            $select['url'] !== $url)
+            return NULL;
+        if (!is_null($select['randstr']))
+            return $this->Make($url);
+        $text = htmlspecialchars($text);
+        return ($this->mysqli->query('INSERT INTO shortlink(randstr, url) VALUES (\'' . $text . '\', \'' . $url . '\');')) ? array('randstr' => $text, 'url' => $url) : 0;
+    }
+    /**
+     * Returns the short URL as the source URL.
+     * @param  string $text Short URL
+     * @return string/null  Returns the source URL,
+     *                      if there is a source URL, or NULL if there is no source URL.
+     */
+    public function LinkCheck($text) {
+        $data = $this->Select($text);
+        return (!is_null($data['url']) && !is_null($data['randstr'])) ? $data['url'] : NULL;
+    }
+    /**
+     * Move the source URL to the page.
+     * @param  string Short URL
+     * @return null
+     */
+    public function move_header($text) {
+        $data = $this->LinkCheck($text);
+        if (!is_null($data)) {
+            header($_SERVER['SERVER_PROTOCOL'] . ' 301 Moved Permanently');
+            header('Location: ' . $data);
+            die('<!doctype html><html><head><title>Move</title></head><body><a href="' . $data . '">Move</a></body></html>');
+        }
+        return NULL;
+    }
+}
+
+$short = new ShortLink();
+
+if ($_POST['url']) {
+    $data = $short->Make($_POST['url'], $_POST['str']);
+    if (!is_null($_POST['str']) &&
+        (strlen($_POST['str']) > 16 || strlen($_POST['str']) < 3)) die('Short URL must be between 3 and 16 characters long.');
+    else if ($data['randstr'] !== $_POST['str'] &&
+        !is_null($_POST['str']) &&
+        $data['url'] === $_POST['url']) die('Already registered - https://' . $_SERVER['HTTP_HOST'] . '/' . $data['randstr']);
+    else if (!is_null($data['url'])) die('https://' . $_SERVER['HTTP_HOST'] . '/' . $data['randstr']);
+    else die('Already registered short URL.');
+}
+if (strlen($_SERVER['QUERY_STRING']) >= 1)
+    $short->move_header($_SERVER['QUERY_STRING']);
+?>
+<form method="post">
+<input type="text" name="url" id="url" value="https://hakase.io/">
+<input type="submit">
+</form>
+Hakase's Short Link Service
diff --git a/shortlink.sql b/shortlink.sql
new file mode 100644
index 0000000..fe6e3a2
--- /dev/null
+++ b/shortlink.sql
@@ -0,0 +1,13 @@
+CREATE TABLE `shortlink` (
+  `id` int(11) NOT NULL,
+  `randstr` varchar(16) NOT NULL,
+  `url` varchar(255) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+ALTER TABLE `shortlink`
+  ADD PRIMARY KEY (`id`) USING BTREE,
+  ADD UNIQUE KEY `randstr` (`randstr`);
+
+ALTER TABLE `shortlink`
+  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
+COMMIT;