无法使用PHP连接到MYSQL

Question

I could not connect to the local host MYSQL database using my simple php code and DOES NOT display anyything. THis is applicable to all users and root.Eventhough the problem is reported many times, i could not fix it. Also it is written in one site that it may have to make changes in php file.Please give me solution for this connection error.

I use php 5.5.9-1 in Ubuntu. MYSQL version is 5.5.38. My code is

<?php

$servername = "localhost";
$username = "root";
$password = "*****";
$conn = mysql_connect($servername, $username, $password);


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

?>

Answer 1

Mysql is deprecated. Use Mysqli .

Create a file and name it as db_connect.php and copy the below code.

<?php
$connection = mysqli_connect("localhost","username","password","database_name");
if (mysqli_connect_errno())
 {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }

Open browser and type http://localhost/db_connect.php . If you see a blank page, your connection is fine. If there's a problem, it will show you the error.

Answer 2

Call to undefined function mysql_connect()

This error message from your comments tells me that you do not have the MySQL extension installed.

Execute this in your terminal to install: sudo apt-get install php5-mysql

Then restart Apache: sudo /etc/init.d/apache2 restart

Please be aware that the "mysql_" functions are marked as deprecated and your script might fail with a future PHP update. Please use "mysqli_" or PDO.