The sanitize_user function in WordPress is used to sanitize and validate a username. This function removes any characters or elements that could be potentially harmful or invalid in a username. It ensures that the username meets the necessary criteria for a valid username in WordPress.
It is commonly used when processing user input from a form, such as when a user is creating an account or updating their profile information. By using sanitize_user, you can make sure that the username provided by the user is safe and compliant with WordPress standards.
Example Usage:
$username = 'john_doe123!';
$sanitized_username = sanitize_user($username);
echo $sanitized_username; // Output: johndoe123