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/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`"
+    );
+}
+
+
+
+?>