WordPress Gist to display First Name in Registration Form

gistfile1.txt

<?php

add_action('register_form','show_first_name' );
add_action('register_post','check_fields',10,3 );
add_action('user_register','register_extra_fields' );




function show_first_name () {
?>

<p>
	<label>First Name </br>
		<input type="text" id="user_email" size="25" value="<?php echo $_POST['first']; ?>" name="first">
	</label>
</p>


<?php }

function check_fields($login,$email,$errors) {


	global $firstname;
	if($_POST['first']=='') {

		$errors->add('empty_realname',"<strong>Error</strong>: Please Enter in First Name");
	}
	else {

		$firstname = $_POST['first'];
	}
}

function register_extra_fields($user_id,$password="",$meta=array()) {

	$userdata = array();
	$userdata['ID'] = $user_id;
	$userdata['first_name'] = $_POST['first'];

	wp_update_user( $userdata );
}


?>