Php, mysql coding error - php

Question

Please tell me that where is error. I am in tention due to this,
Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\kalooo1\includes\db.php:2 Stack
trace: #0 C:\xampp\htdocs\kalooo1\index.php(21): include() #1 {main}
thrown in C:\xampp\htdocs\kalooo1\includes\db.php on line 2
db.php
<?php
mysql_connect("localhost","root","");``
mysql_select_db("kalooo");
?>
index.php(21)
include("includes/db.php");

Answer 1

You are getting that error simple because you are using a newer version of php that does not support mysql_* functions, those functions have been depreciated and completely removed from the latest version of php.
You should use mysqli prepared functions or pdo prepared statements.
using mysqli to connect to database you will use it like this:
<?php
$servername = "localhost";
$username = "yourusername";
$password = "yourpassword";
$dbname = "yourdatabse";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
?>
using PDO, you would connect like this:
<?php
$host = 'localhost';
$db = 'yourdb';
$user = 'yourusername';
$pass = 'yourpassword';
$charset = 'utf8';
$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$opt = [
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => false,
];
$pdo = new PDO($dsn, $user, $pass, $opt);
?>
The are good tutorials on the net that you can use to better your understanding, I personally enjoy this site https://phpdelusions.net/pdo You should visit it you will be a pro in no time.

Answer 2

use mysqli_connect("localhost","root","","db_name");
or use
store this in separate php file.
include that file like this. include 'db.php';
try this....

Answer 3

try this
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>