Custom Registered FIelds Plugin

<?php
/*
Plugin Name: Custom Register Fields
Plugin URI: http://www.lcavanagh.bluehoststaff.com/
Description: Add first name, last name and job title.
Author: Luke Cavanagh
Version: 1.0
Author URI: http://www.lcavanagh.bluehoststaff.com/
GNU General Public License, Free Software Foundation <http://creativecommons.org/licenses/GPL/2.0/>
*/
//1. Add a new form element...
add_action( 'register_form', 'custom_register_form' );
function custom_register_form() {
$first_name = ( ! empty( $_POST['first_name'] ) ) ? trim( $_POST['first_name'] ) : '';
$last_name = ( ! empty( $_POST['last_name'] ) ) ? trim( $_POST['last_name'] ) : '';
$job_title = ( ! empty( $_POST['job_title'] ) ) ? trim( $_POST['job_title'] ) : '';
?>
<p>
<label for="first_name"><?php _e( 'First Name', 'mydomain' ) ?><br />
<input type="text" name="first_name" id="first_name" class="input" value="<?php echo esc_attr( wp_unslash( $first_name ) ); ?>" size="25" /></label>
</p>
<p>
<label for="last_name"><?php _e( 'Last Name', 'mydomain' ) ?><br />
<input type="text" name="last_name" id="last_name" class="input" value="<?php echo esc_attr( wp_unslash( $last_name ) ); ?>" size="25" /></label>
</p>
<p>
<label for="job_title"><?php _e( 'Job Title', 'mydomain' ) ?><br />
<input type="text" name="job_title" id="job_title" class="input" value="<?php echo esc_attr( wp_unslash( $job_title ) ); ?>" size="25" /></label>
</p>
<?php
}
//2. Add validation. In this case, we make sure first_name is required.
add_filter( 'registration_errors', 'custom_registration_errors', 10, 3 );
function custom_registration_errors( $errors, $sanitized_user_login, $user_email ) {
if ( empty( $_POST['first_name'] ) || ! empty( $_POST['first_name'] ) && trim( $_POST['first_name'] ) == '' ) {
$errors->add( 'first_name_error', __( '<strong>ERROR</strong>: You must include a first name.', 'mydomain' ) );
}
if ( empty( $_POST['last_name'] ) || ! empty( $_POST['last_name'] ) && trim( $_POST['last_name'] ) == '' ) {
$errors->add( 'last_name_error', __( '<strong>ERROR</strong>: You must include a last name.', 'mydomain' ) );
}
if ( empty( $_POST['job_title'] ) || ! empty( $_POST['job_title'] ) && trim( $_POST['job_title'] ) == '' ) {
$errors->add( 'job_title_error', __( '<strong>ERROR</strong>: You must include a job title.', 'mydomain' ) );
}
return $errors;
}
//3. Finally, save our extra registration user meta.
add_action( 'user_register', 'custom_user_register' );
function custom_user_register( $user_id ) {
if ( ! empty( $_POST['first_name'] ) ) {
update_user_meta( $user_id, 'first_name', trim( $_POST['first_name'] ) );
}
if ( ! empty( $_POST['last_name'] ) ) {
update_user_meta( $user_id, 'last_name', trim( $_POST['last_name'] ) );
}
if ( ! empty( $_POST['job_title'] ) ) {
update_user_meta( $user_id, 'job_title', trim( $_POST['job_title'] ) );
}
}
add_action( 'show_user_profile', 'custom_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'custom_show_extra_profile_fields' );
function custom_show_extra_profile_fields( $user ) { ?>
<h3>Extra profile information</h3>
<table class="form-table">
<tr>
<th><label for="job_title">Job Title</label></th>
<td>
<input type="text" name="job_title" id="job_title" value="<?php echo esc_attr( get_the_author_meta( 'job_title', $user->ID ) ); ?>" class="regular-text" /><br />
<span class="description">Please enter your Job Title.</span>
</td>
</tr>
</table>
<?php }
add_action( 'personal_options_update', 'custom_save_extra_profile_fields' );
add_action( 'edit_user_profile_update', 'custom_save_extra_profile_fields' );
function custom_save_extra_profile_fields( $user_id ) {
if ( !current_user_can( 'edit_user', $user_id ) )
return false;
/* Copy and paste this line for additional fields. Make sure to change 'job_title' to the field ID. */
update_usermeta( absint( $user_id ), 'job_title', wp_kses_post( $_POST['job_title'] ) );
}