What are the consequences of relying on outdated code for long-term website functionality?

Relying on outdated code for long-term website functionality can lead to security vulnerabilities, compatibility issues with modern browsers, and decreased performance. To solve this issue, it is important to regularly update and refactor the codebase to ensure it is up-to-date with the latest technologies and best practices. 

// Example of updating outdated code by using modern PHP syntax
// Old code using mysql_ functions
$connection = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database_name', $connection);
$result = mysql_query('SELECT * FROM table_name', $connection);
while ($row = mysql_fetch_assoc($result)) {
    // Process data
}
mysql_close($connection);

// Updated code using mysqli_ functions
$connection = mysqli_connect('localhost', 'username', 'password', 'database_name');
$result = mysqli_query($connection, 'SELECT * FROM table_name');
while ($row = mysqli_fetch_assoc($result)) {
    // Process data
}
mysqli_close($connection);

Keywords

outdated code PHP security vulnerabilities deprecated functions maintenance costs

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