Add and Remove fields in Profile page

This answer is copied from the best post over this topic! I could’ve just given you the links, but that would get me a comment from the mod to post sample code 😉

For adding the fields:

add_action( 'show_user_profile', 'my_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'my_show_extra_profile_fields' );

function my_show_extra_profile_fields( $user ) { ?>
    <h3>Extra profile information</h3>
    <table class="form-table">
        <tr>
            <th><label for="twitter">Twitter</label></th>
            <td>
                <input type="text" name="twitter" id="twitter" value="<?php echo esc_attr( get_the_author_meta( 'twitter', $user->ID ) ); ?>" class="regular-text" /><br />
                <span class="description">Please enter your Twitter username.</span>
            </td>
        </tr>
    </table>

And for saving the data:

add_action( 'personal_options_update', 'my_save_extra_profile_fields' );
add_action( 'edit_user_profile_update', 'my_save_extra_profile_fields' );

function my_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 'twitter' to the field ID. */
    update_usermeta( $user_id, 'twitter', $_POST['twitter'] );
}

Another helpful link here.

Thank You Justin Tadlock! 😀