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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

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