如果第三方插件（您要扩展的插件）使用设置API，如果您现在打开由第三方插件定义的选项页面和选项组，则可以添加新的设置字段。也只需使用设置：

首先add_setting_field() 您可以向第三个插件定义的任何设置部分添加新字段register_setting() 您可以在插件定义的选项组中注册新设置一个非常简单的例子：

add_action( \'admin_init\', \'cyb_add_settings_field_to_plugin\' );
function cyb_add_settings_field_to_plugin() {

    add_settings_field(
        \'some_id\',
        \'Some title\',
        \'cyb_field_callback\',
        \'plugin-settins-page\', // Settings page defined by the third party plugin
        \'plugin-settings-section\', // Section defined by the third party plugin
        array()
    );

    register_setting(
        \'option-group\', // Options group defined by third party plugin
        \'my-option-name\', // Custom option name
        \'cyb_sanitize_callback\' // Sanitize
    );

}

function cyb_field_callback() {
    $value = get_option( \'my-option-name\' );
    ?>
    <input type="text" id="some_id" name="my-option-name" value="<?php echo esc_attr( $value ); ?>" />
    <?php
}

function cyb_sanitize_callback( $inputs ) {
    // Do sanitization of the the inputs
    return $inputs;
}

add_action( \'admin_init\', \'cyb_add_settings_field_to_plugin\' );
function cyb_add_settings_field_to_plugin() {

    add_settings_section(
        \'new-settings-section\',
        \'Settings Section Title\',
        \'cyb_print_section_info\', // Callback
        \'plugin-settins-page\' // Settings page defined by the third party plugin
    );  
    add_settings_field(
        \'some_id\',
        \'Some title\',
        \'cyb_field_callback\',
        \'plugin-settins-page\', // Settings page defined by the third party plugin
        \'new-settings-section\', // My custom section defined above
        array()
    );
    register_setting(
        \'option-group\', // Options group defined by third party plugin
        \'my-option-name\', // Option name
        \'cyb_sanitize_callback\' // Sanitize
    );
}

function cyb_print_section_info() {
    echo \'Section info\';
}

function cyb_field_callback() {
    $value = get_option( \'my-option-name\' );
    ?>
    <input type="text" id="some_id" name="my-option-name" value="<?php echo esc_attr( $value ); ?>" />
    <?php
}

function cyb_sanitize_callback( $inputs ) {
    // Do sanitization of the the inputs
    return $inputs;
}