What are best practices for updating outdated scripts in PHP web development?

When updating outdated scripts in PHP web development, it is important to review the code for deprecated functions or syntax that may no longer be supported in newer versions of PHP. One common issue is the use of the mysql extension, which has been deprecated since PHP 5.5 and removed in PHP 7. Instead, it is recommended to use the mysqli or PDO extensions for database connections. 

// Before updating:
$conn = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database_name', $conn);

// After updating:
$conn = mysqli_connect('localhost', 'username', 'password', 'database_name');

Keywords

security vulnerabilities deprecated functions code refactoring PHP version compatibility error handling

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