php7 cannot connect to mysql

1. Add the php.ini file

In the new version of PHP7, there is no php.ini, so you need to create it yourself. The new version has two php.ini-development and php.ini-production files. Just copy one and rename it to php.ini.

2. Modify the content of the php.ini file

Generally, such files have access permission restrictions. Right-click the php.ini file and modify the operation permissions of the file. , writing is allowed.

To connect to MySQL, remove the semicolon in front of extension=pdo_mysql. To connect to other databases, you also need to remove the corresponding semicolon.

Then On windows: extension_dir = “ext” fill in the address here completely, such as extension_dir = “C:\Program Files\PHP\ext”.

3. Use PDO to connect (mysqli is also available)

The Mysql_connect module is no longer available. The new version needs to use PDO or mysqli to connect.

<?php
$servername = "localhost";
$username = "root";
$password = "your password";
 
try {
    $conn = new PDO("mysql:host=$servername;dbname=test;port=3306", $username, $password);
    echo "连接成功"; 
}
catch(PDOException $e)
{
    echo $e->getMessage();
}
?>

Open the php file, if "Connection successful" is displayed.

Attachment: The php file must be opened on the server. You can enter: php -S localhost:port number in the command line cmd, you can Run a virtual server that comes with PHP on your PC, and then you can open a browser to access it. You only need to enter localhost:port number in the address bar.

Recommended tutorial: PHP video tutorial

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