When you are creating a WordPress plugin to play with users’ profile meta data, you may need to use some different meta data those are not exists in user profile page. So you must want to have new custom meta field with user profile. Sometimes we call it user custom field. How to do add this custom field? Here I will show you the complete code snippet and a simple demo plugin.

Suppose you want to add an extra custom field to store user’s twitter account username. By default this field is not exists in profile page ( As WordPress version 3.5.1). Add following code snippet in your plugin file or in theme functions.php. It will show an extra input field in user profile edit page. It will add a new meta key and value in the WordPress user meta table wp_usermeta in database. This new key will be loaded with user object.

add_action( 'show_user_profile', 'oneTarek_extra_user_profile_fields' );
add_action( 'edit_user_profile', 'oneTarek_extra_user_profile_fields' );
add_action( 'personal_options_update', 'oneTarek_save_extra_user_profile_fields' );
add_action( 'edit_user_profile_update', 'oneTarek_save_extra_user_profile_fields' );

function oneTarek_save_extra_user_profile_fields( $user_id )
 {
 if ( !current_user_can( 'edit_user', $user_id ) ) { return false; }
 update_user_meta( $user_id, 'oneTarek_twitter', $_POST['oneTarek_twitter'] );
 }
#Developed By oneTarek , http://oneTarek.com
function oneTarek_extra_user_profile_fields( $user )
 { ?>
 <h3>Extra Custom Meta Fields</h3>

 <table class="form-table">
 <tr>
 <th><label for="oneTarek_twitter">Twitter User Name</label></th>
 <td>
 <input type="text" id="oneTarek_twitter" name="oneTarek_twitter" size="20" value="<?php echo esc_attr( get_the_author_meta( 'oneTarek_twitter', $user->ID )); ?>">
 <span class="description">Please enter your Twitter Account User name, eg: oneTarek</span>
 </td>
 </tr>
 </table>
<?php }?>

I made a demo plugin with above codes. User my demo plugin to be clear about above codes.
Download My Demo Plugin to Add User Custom Field

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