What are the best practices for interpreting PHP manuals when transitioning to PHP7?

When transitioning to PHP7, it is important to carefully review the PHP manuals to understand any changes or deprecations in the language. Best practices include paying attention to the migration guides, checking for deprecated functions or features, and testing code thoroughly to ensure compatibility with PHP7.

// Example of checking for deprecated functions in PHP7
if (function_exists('mysql_connect')) {
    echo "mysql_connect function is deprecated in PHP7. Please use mysqli or PDO instead.";
}