php mysql_connect code example

Example 1: php connect to mysql

$servername = "localhost";
$username = "username";
$password = "password";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";


Simplified

$conn = mysqli_connect('localhost', 'username', 'password');
$database = mysqli_select_db($conn, 'database');

Example 2: mysql connect php

# MySql improved
<?php
    $mysqli = new mysqli("localhost", "username", "password", "dbname");
	$result = $mysqli->query("SELECT lastname FROM employees");
?>
# Connection with PDO
<?php
    $myPDO = new PDO('mysql:host=localhost;dbname=dbname', 'username', 'password');
	$result = $myPDO->query("SELECT lastname FROM employees");
?>
# With PHP legacy functions:
<?php
    mysql_connect('localhost','username','password');
    mysql_select_db("dbname");
	$result = mysql_query('SELECT lastname FROM employees');
?>

Example 3: php mysql connect

<?php
$servername = "localhost";
$username = "username";
$password = "password";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>

Example 4: $conn php

<?php
    $user = "username";
    $pass = "password";
    $host = "host";
    $dbdb = "database";
    
$conn = new mysqli($host, $user, $pass, $dbdb);
   if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
?>

Example 5: php mysql connect

$host = 'localhost'; // URL to the server
$user = 'root'; // Username (xampp = root)
$pw = ''; // Password (xampp = )
$dbname = 'database'; // The name of your database 
$dsn = "mysql:host=$host;dbname=$dbname";
$options = [PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8']; // If you want to use utf-8 use this line

$db = new PDO($dsn, $user, $pw, $options); // Database Object
$db -> setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); // Use this if you want an associate array
// $db -> setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); Use this if you want an indexed array

$qry = 'select * from table;'; // Your query
$result = $db -> query($qry); // execute query

while ($row = $result -> fetch()) {
    $id = $row[/*column-name*/];
}