In what situations is using var_dump more effective than print_r when debugging PHP form submissions?

When debugging PHP form submissions, using var_dump is more effective than print_r when you need to see the data types and values of variables, as var_dump provides more detailed information including the data type and length of strings. This can be particularly helpful when dealing with complex data structures or when trying to pinpoint specific issues in the form submission data.

// Using var_dump for debugging form submissions
var_dump($_POST);