What are some best practices for handling arrays in PHP to avoid issues with outdated functions?

Using outdated functions when working with arrays in PHP can lead to compatibility issues and potential security vulnerabilities. To avoid these issues, it is recommended to use modern array functions provided by PHP, such as array_map(), array_filter(), and array_reduce(). These functions offer more flexibility and improved performance compared to their outdated counterparts.

// Example of using array_map() to transform an array
$numbers = [1, 2, 3, 4, 5];
$multipliedNumbers = array_map(function($num) {
    return $num * 2;
}, $numbers);

print_r($multipliedNumbers);