php - (HY000/2002): Operation timed out in macOS

one text

I am learning to connect to sql databases using php:

https://www.youtube.com/playlist?list=PLF8OvnCBlEY1bFcTW9JKKO7WJn_Bf9LZ1

But the connection is not made, and the error code is:

Warning: mysqli_connect(): (HY000/2002): Operation timed out in /Users/Ahmead/Sites/PHPTest/myTutorials/dbconnect.php on line 12
cannot connect to database fileld:Operation timed out

myCode php:

  <?php

$host="172.0.0.1";
$user="root";
$password="";
$database="admins";

$connect= mysqli_connect($host, $user, $password, $database);

  if(mysqli_connect_errno()){
      die("cannot connect to database fileld:". mysqli_connect_error());
  }
 else {
      echo 'Database is connected'; 
}

  ?>

Source