I define redis.php like

<?php
global $redis;
$redis = new Redis();
// Connecting to Redis
try {
    $redis->connect("127.0.0.1", 6379);
} catch (RedisException $e) {
    exit;
}
$redis->auth(["admin", "admin"]);

try {
    if ($redis->ping()) {
        echo json_encode(["status" => true]);
    } else {
        echo json_encode(["status" => false]);
        exit;
    }
} catch (RedisException $e) {
   echo json_encode(["status" => false]);
   exit;
}

Then, I use this redis by require_once("redis.php") into different services where I need to use Redis for caching.

service.php

<?PHP
require("redis.php");
// do something with Redis: check loggedin key, for example
echo json_encode(["loggedin": true, "username": "test"]);

The output I get looks like this:

Error: {"readyState":4,"responseText":"{"status":true}{"loggedin":true,"username":"test"}","status":200,"statusText":"OK"} 
parsererror {}

The response text of the error object shows two different JSON documents returned by redis.php and service.php. My question is: how do I get only the JSON document returned by service.php?