mysql connect php

1<?php
2$servername = "localhost";
3$username = "username";
4$password = "password";
5$dbname = "myDB";
6
7// Create connection
8$conn= mysqli_connect($servername,$username,$password,$dbname);
9// Check connection
10if (!$conn) {
11  die("Connection failed: " . mysqli_connect_error());
12}
13echo "Connected Successfully.";
14?>

1<?php
2$servername = "localhost";
3$username = "username";
4$password = "password";
5
6try {
7    $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
8    // set the PDO error mode to exception
9    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
10    echo "Connected successfully";
11    }
12catch(PDOException $e)
13    {
14    echo "Connection failed: " . $e->getMessage();
15    }
16?>

1# MySql improved
2<?php
3    $mysqli = new mysqli("localhost", "username", "password", "dbname");
4	$result = $mysqli->query("SELECT lastname FROM employees");
5?>
6# Connection with PDO
7<?php
8    $myPDO = new PDO('mysql:host=localhost;dbname=dbname', 'username', 'password');
9	$result = $myPDO->query("SELECT lastname FROM employees");
10?>
11# With PHP legacy functions:
12<?php
13    mysql_connect('localhost','username','password');
14    mysql_select_db("dbname");
15	$result = mysql_query('SELECT lastname FROM employees');
16?>

1Just include this Temlate in other file using PHP Include/Require Keywords
2 And Make Connection In One Shot :)
3
4<?php
5  
6    // echo "Welcome to Connecting of DB Tutorial!";
7    // echo "<br>";
8
9    // 1. PDO - Php Data Objects
10    // 2. MySQLi extension
11
12    // Set Connection Variable
13    $server = "localhost";
14    $username = "root";
15    $password = "";
16    $database = "test";
17
18    // Create A Connection
19    $con = mysqLi_connect($server, $username, $password, $database);
20
21     // Check For Connection
22     if(!$con){
23        die ("Connection Terminated! by Die() function". mysqLi_connect_error());
24       
25    }
26    else {
27        echo "Connection Succefully Happened! <br>";
28    }
29
30
31    ?>

1<?php
2$servername = "localhost";
3$username = "username";
4$password = "password";
5
6// Create connection
7$conn = new mysqli($servername, $username, $password);
8
9// Check connection
10if ($conn->connect_error) {
11    die("Connection failed: " . $conn->connect_error);
12}
13echo "Connected successfully";
14?>

1$host = 'localhost'; // URL to the server
2$user = 'root'; // Username (xampp = root)
3$pw = ''; // Password (xampp = )
4$dbname = 'database'; // The name of your database 
5$dsn = "mysql:host=$host;dbname=$dbname";
6$options = [PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8']; // If you want to use utf-8 use this line
7
8$db = new PDO($dsn, $user, $pw, $options); // Database Object
9$db -> setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); // Use this if you want an associate array
10// $db -> setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); Use this if you want an indexed array
11
12$qry = 'select * from table;'; // Your query
13$result = $db -> query($qry); // execute query
14
15while ($row = $result -> fetch()) {
16    $id = $row[/*column-name*/];
17}