注册表表单对自定义字段有不同的挂钩。

我希望这个源代码示例对您有所帮助。

    /**
     * Add custom field to registration form
     */
    add_action( \'register_form\', \'fb_show_first_name_field\' );
    add_action( \'register_post\', \'fb_check_fields\', 10, 3 );
    add_action( \'user_register\', \'fb_register_extra_fields\' );

    function fb_show_first_name_field() {
    ?>
        <p>
            <label>Twitter<br/>
                <input id="twitter" type="text" tabindex="30" size="25" value="<?php echo $_POST[\'twitter\']; ?>" name="twitter" />
            </label>
        </p>
    <?php
    }

    function fb_check_fields ( $login, $email, $errors ) {
        global $twitter;

        if ( \'\' === $_POST[\'twitter\'] )
            $errors->add( \'empty_realname\', "<strong>ERROR</strong>: Please Enter your twitter handle" );
        else
            $twitter = $_POST[\'twitter\'];

    }

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

        update_user_meta( $user_id, \'twitter\', $_POST[\'twitter\'] );
    }

    /**
     * Add additional custom field
     */
    add_action( \'show_user_profile\', \'fb_show_extra_profile_fields\' );
    add_action( \'edit_user_profile\', \'fb_show_extra_profile_fields\' );

    function fb_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>
    <?php
    }

    add_action( \'personal_options_update\',  \'fb_save_extra_profile_fields\' );
    add_action( \'edit_user_profile_update\', \'fb_save_extra_profile_fields\' );
    function fb_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_user_meta( $user_id, \'twitter\', $_POST[\'twitter\'] );
    }