Begin with the connection between php and mysql.

It has a template that loads all the friends of userID 666.
It uses a connect.php and a friendship.php

website/queries/connect.php

@@ -0,0 +1,13 @@
+<?php
+
+$dbconf = simplexml_load_file("/var/mysql_config.xml");
+if ($dbconf === FALSE) {
+    die("Error parsing XML file");
+}
+else {
+    $db = new PDO("mysql:host=$dbconf->mysql_host;dbname=$dbconf->mysql_database;charset=utf8",
+        "$dbconf->mysql_username", "$dbconf->mysql_password")
+    or die('Error connecting to mysql server');
+}
+
+?>

website/queries/friendship.php

@@ -0,0 +1,24 @@
+<?php
+
+function selectAllFriends($db, $userID) {
+    return $db->query("
+    SELECT
+        `user`.`username`,
+        `user`.`profilepicture`,
+        `user`.`onlinestatus`,
+        `user`.`role`
+    FROM
+        `user`    
+    INNER JOIN
+        `friendship`
+    WHERE
+        `friendship`.`user1ID` = $userID AND
+        `friendship`.`user2ID` = `user`.`userID` OR
+        `friendship`.`user2ID` = $userID AND
+        `friendship`.`user1ID` = `user`.`userID`"
+    );
+}
+
+
+
+?>