What are the common pitfalls when dealing with PHP and MySQL connections during system updates?

Common pitfalls when dealing with PHP and MySQL connections during system updates include not updating the database connection details in the PHP code, causing connection failures, and not handling errors properly, leading to potential security vulnerabilities. To solve this, ensure that the database connection details in the PHP code are updated to match the new system configuration and implement error handling to catch any connection issues. 

<?php
$servername = "new_server";
$username = "new_username";
$password = "new_password";
$dbname = "new_database";

// 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

PHP MySQL database connection system updates error handling

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