Fatal error: Uncaught exception 'MongoConnectionException' with message - php

I am testing the mongoDB in localhost and successfully installed the mongoDB in localhost. I have tried to connect the mongoDB using PHP in localhost.
It throws the error like 'Authentication failed'. It is successfully authenticated in cmd prompt.
Below is my code:
$username = 'testUser';
$password = 'testPassword';
$m = new MongoClient("mongodb://testUser:testPassword#localhost", array("db" => "testdb"));
Fatal error: Uncaught exception 'MongoConnectionException' with message 'Failed to connect to: localhost:27017: No connection could be made because the target machine actively refused it. ' in E:\xampp\htdocs\xampp\test.php:3 Stack trace: #0 E:\xampp\htdocs\xampp\test.php(3): MongoClient->__construct('localhost:27017', Array) #1 {main} thrown in E:\xampp\htdocs\xampp\test.php on line 3
I have also changed the localhost to ip(127.0.0.1) address but no use. Thanks in advance

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<?php
require("vendor/autoload.php");
$client = new MongoDB\Client(
'mongodb+srv://127.0.0.1/test?w=majority'
);
$db = $client->test;
returns :
PHP Fatal error: Uncaught MongoDB\Driver\Exception\InvalidArgumentException: Failed to parse URI options: Failed to look up SRV record "_mongodb._tcp.127.0.0.1": The specified host is unknown. in /opt/wira/test_mongodb/vendor/mongodb/mongodb/src/Client.php:126
Stack trace:
#0 /opt/wira/test_mongodb/vendor/mongodb/mongodb/src/Client.php(126): MongoDB\Driver\Manager->__construct()
#1 /opt/wira/test_mongodb/test.php(5): MongoDB\Client->__construct()
#2 {main}
thrown in /opt/wira/test_mongodb/vendor/mongodb/mongodb/src/Client.php on line 126

How i can connect MongoDB online cloud in PHP

i want online connection with MongoDB cloud in PHP
same source file working properly when i run on localhost in my laptop with empty $server string while i use mongoDb server cloud then i face an error
<?php
session_start();
// $server="";
$server='mongodb+srv://mongo_user_1:<password>#mongodb01-dolny.mongodb.net/test?retryWrites=true&w=majority';
$mongo = new MongoClient($server);
$db=$mongo->blogPosting;
$admin_cl=$db->admin;
$category_cl=$db->category;
$blog_cl=$db->blog;
$contact_cl=$db->contact;
$blog_comment_cl=$db->blog_comment;
?>
Fatal error: Uncaught exception 'MongoConnectionException' with
message '- Found unknown connection string option 'retryWrites' with
value 'true'' in G:\xampp\htdocs\mongo_blog\mongoDb.php:5 Stack trace:
0 G:\xampp\htdocs\mongo_blog\mongoDb.php(5): MongoClient->__construct('mongodb+srv://m...') #1
G:\xampp\htdocs\mongo_blog\blog\index.php(1):
include('G:\xampp\htdocs...') #2 {main} thrown in
G:\xampp\htdocs\mongo_blog\mongoDb.php on line 5

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I imported the proper mongodb.dll file in php/ext and also configured php.ini but it seems that I can't connect to mongodb via my php code. Example
<?php
// connect to mongodb
$m = new MongoClient();
echo "Connection to database successfully";
// select a database
?>
Fatal error: Uncaught Error: Class 'MongoClient' not found in C:\xampp\htdocs\date\include\db2.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\date\include\db2.php on line 3

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I am trying to connect to MongoDB from local (a Azure VM). I can connect when I try in my localhost workspace with the URL of the VM. But, when I try to connect in localhost there is a error:
At localhost:
$m = new Mongo("mongodb://xxx.cloudapp.net:27017");
At local VM:
$m = new Mongo("mongodb://localhost:27017");
I also try with: 127.0.0.1 and xxx.cloudapp.net.
This is the error:
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This is not a new issue. This is a regular issue, the problem is with the instalation.
Please check it out: http://www.php.net/manual/en/mongo.installation.php#mongo.installation.fedora
You have to run
$ /usr/sbin/setsebool -P httpd_can_network_connect 1 and then restart apache service to fix the problem.
Thank you all

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here's the code
$db = new PDO("informix:host=192.168.*.*; service=1565;
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print "Connection Established!\n\n";
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I receive the following error:
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How can I fix this?

I think you should also set the DB_LOCALE environment variable.
When the client application requests a connection, it sends information, including the DB_LOCALE to the database server.

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