added live sending messages from user 2 to user 2

website/queries/private_message.php

@@ -0,0 +1,51 @@
+<?php
+
+function get100ChatMessagesFromN($n, $user1ID, $user2ID) {
+    $db = $GLOBALS["db"];
+    $stmt = $db->prepare("
+    SELECT
+        *
+    FROM
+        `private_message`
+    WHERE
+        `origin` = :user1 AND 
+        `destination` = :user2 OR 
+        `origin` = :user2 AND
+        `destination` = :user1
+    ORDER BY
+        `creationdate` DESC 
+    LIMIT 
+        :n, 100
+    ");
+
+    $stmt->bindParam(":user1", $user1ID);
+    $stmt->bindParam(":user2", $user2ID);
+    $stmt->bindParam(":n", $n);
+
+    return $stmt->execute();
+}
+
+function sendMessage($destination, $content) {
+    $db = $GLOBALS["db"];
+    $stmt = $db->prepare("
+    INSERT INTO
+        `private_message`
+    (
+        `origin`,
+        `destination`,
+        `content`
+    )
+    VALUES
+    (
+        :origin,
+        :destination,
+        :content
+    )
+    ");
+
+    return $stmt->execute(array(
+        "origin" => 2,
+        "destination" => $destination,
+        "content" => $content
+    ));
+}