username_check()

public function username_check(string $str): string|bool

Description

Checks the availability of a username and validates it against existing usernames in the 'trongate_administrators' table.

This method is designed to be invoked as a form validation callback.

Parameters

Parameter	Type	Description	Default	Required
$str	string	The username to be checked.	N/A	Required

Return Value

Type	Description
string\|bool	Returns an error message (string) if the username is not available, otherwise returns TRUE (bool).

Example Usage

$submit = post('submit');

if ($submit == 'Submit') {
    // Set validation rules for username, password, and repeat password.
    $this->validation->set_rules('username', 'username', 'required|min_length[5]|callback_username_check');
    $this->validation->set_rules('password', 'password', 'required|min_length[5]');
    $this->validation->set_rules('repeat_password', 'repeat password', 'matches[password]');

    $result = $this->validation->run();

    if ($result == true) {
        // Form validation success.
        echo 'Success!';
    } else {
        // Form validation error(s);
        echo validation_errors('<div class="error-message">', '</div>');
    }
}