How can developers effectively debug PHP scripts to identify issues with form data submission?

To effectively debug PHP scripts to identify issues with form data submission, developers can use functions like `var_dump()` or `print_r()` to display the form data being submitted and check for any errors. They can also use tools like Xdebug to step through the code and track the flow of data. Additionally, checking for any validation errors or incorrect form field names can help pinpoint the issue.

// Display form data being submitted
var_dump($_POST);

// Check for validation errors
if($_POST['name'] == ''){
  echo 'Name field is required';
}

// Check form field names
if(!isset($_POST['email'])){
  echo 'Email field is missing';
}