Create user from email submitted

create_user.php

add_action('adqv_email_submitted', 'advq_create_new_user_from_email');
function advq_create_new_user_from_email( $email_address ){

	if( null == username_exists( $email_address ) ) {

		// Generate the password and create the user
		$password = wp_generate_password( 12, false );
		$user_id = wp_create_user( $email_address, $password, $email_address );

		// Set the nickname
		wp_update_user(
		  array(
			'ID'          =>    $user_id,
			'nickname'    =>    $email_address
		  )
		);

	  } // end if
}