You have a PHP script and you need to display an error message if a required field is left empty. How would you do this?

  • Use the isset() function to check if the field is set and display an error message if it is not
  • Check if the field is empty using the empty() function and display an error message if it is
  • Use JavaScript to validate the field before submitting the form and display an error message if it is empty
  • Implement server-side validation in PHP to check if the field is empty and display an error message
To display an error message in PHP if a required field is left empty, you can implement server-side validation. Check if the field is empty using the empty() function, and if it is, display an error message to the user. This ensures that the user is informed about the missing required field. For more details on server-side form validation in PHP, check: php.net/manual/en/tutorial.forms.php#tutorial.forms.validation
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