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Create a new admin user in WordPress via code. Drop this file in the mu-plugins directory and update the variables, then load a page in WordPress to create the user. Remove the file when done.
add_action( 'init', function () {
$username = 'admin';
$password = 'password';
$email_address = '';
if ( ! username_exists( $username ) ) {
$user_id = wp_create_user( $username, $password, $email_address );
$user = new WP_User( $user_id );
$user->set_role( 'administrator' );
} );

wpscholar commented Jul 6, 2015

To send an email to the new user, just add this below line 12:
wp_new_user_notification($user_id, $password);


wpscholar commented Jul 13, 2015

On multisite, just do this to grant super admin privileges: grant_super_admin( $user_id );

greguly commented Nov 5, 2015

Thanks for sharing this.

I knew this would come in hand one day, again...

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