What are common reasons for a PHP forum to display a critical error related to database connectivity?

Common reasons for a PHP forum to display a critical error related to database connectivity include incorrect database credentials, server connection issues, or database server downtime. To solve this issue, check the database credentials in the PHP code to ensure they are correct, verify that the database server is running, and troubleshoot any connection problems. 

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

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

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

Keywords

MySQL PDO database connection SQL injection error handling

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