Online PHP editor | output for lfFF7

<?php // connect to the database $link = mysql_connect('localhost','root','root'); mysql_select_db("goal_database",$link); function editActivity() { $response = array(); if (isset$_POST("aid")) { $aid = intval($_POST["aid"]); $query = "Update Activities SET ExerciseID=14 WHERE ActivityID='$aid';"; $result = mysql_query($query) or die(mysql_error()); if ($result) { $response["error"] = false; $response["message"] = "Activity updated successfully!"; } else { $response["error"] = true; $response["message"] = "Failed to update activity!"; } } else { $response["error"] = true; $response["message"] = "Things are missing!"; } // echo json response echo json_encode($response); } editActivity();