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I know the former allows additional parameters, so you can more user info, but other then that, why do both exist?

The specific reason I want to know is that wp_insert_user() is happening REALLY slowly. Somewhere between 5 - 10 seconds. I don't remember having this problem in the past, when I was using create_user, so I'm wondering if there's a lot more happening behind the scenes with one as opposed to the other.


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up vote 3 down vote accepted

None. The whole source of wp_create_user() is:

function wp_create_user($username, $password, $email = '') {
    $user_login = esc_sql( $username );
    $user_email = esc_sql( $email    );
    $user_pass = $password;

    $userdata = compact('user_login', 'user_email', 'user_pass');
    return wp_insert_user($userdata);

It just calls insert version almost immediately, basically a shorthand wrapper. As for why it exists - core works in mysterious ways and (short of hunting down developer by version control history and asking) there is rarely way to tell. :)

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