In the context of the described registration form, what strategies can be implemented to prevent empty values from being passed to the insert_user() function?

To prevent empty values from being passed to the insert_user() function, we can implement client-side validation using JavaScript to check if the input fields are empty before submitting the form. Additionally, server-side validation should also be implemented in the PHP code to double-check the input values before processing them. 

// Client-side validation using JavaScript
<script>
function validateForm() {
  var username = document.getElementById("username").value;
  var password = document.getElementById("password").value;
  
  if (username == "" || password == "") {
    alert("Username and password must be filled out");
    return false;
  }
}
</script>

// Server-side validation in PHP
if (empty($_POST['username']) || empty($_POST['password'])) {
  echo "Username and password must be filled out";
} else {
  // Call insert_user() function
}

Keywords

registration form empty values prevent insert_user() strategies

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