Can I use the different settings sections over different pages using the save options group?

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I registered one options group with few different options sections. Each section is meant for different page. 

register_setting(                       // http://codex.wordpress.org/Function_Reference/register_setting
        'mhp_options',                  // Options group
        'mhp_plugin_options',           // Database option
        'mhp_plugin_options_validate'   // The sanitization callback,
);

// Manage Menu section
add_settings_section(                   // http://codex.wordpress.org/Function_Reference/add_settings_section
        $mhp_manage_menu_section,   // Unique identifier for the settings section
        __('Manage Menu Settings', 'mhp'),  // Section title
        '__return_false',               // Section callback (we don't want anything)
        $mhp_manage_menu_section            // Menu slug
);
add_settings_section(                   
        $mhp_home_page_layout_settings_section,     
        __('Home Page Layout Settings', 'mhp'),     
        '__return_false',               
        $mhp_home_page_layout_settings_section          
);

Then each page is using

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settings_fields( 'mhp_options' ); 
do_settings_sections( $mhp_manage_menu_section);

so the other page is using 

settings_fields( 'mhp_options' ); 
do_settings_sections( $mhp_home_page_layout_settings_section);

but it looks like on save only current section is saved in the options table. What ever was already there is deleted.

Do I have to create new options group for each page or is there any other solution?

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2 comments

  1. The solution is to merge existing options before saving options in case not all options are presented on the page we are about save.

    So in the end of $sanitize_callback in register_setting function just before I return the data I call below function where $existing are all existing options saved in database.

    function merge_options( $existing,  $input ) { // Merges existing options with $input to preserve existing options

    if ( !is_array( $existing ) || !is_array( $input ) ) // something went wrong
        return $data;
    return array_merge( $existing, $input );
}

  2. To complement @Radek’s answer, here is another way to use his solution.

    public function sanitize_callback ( $options )
{
    $saved_options = $this->get_option( 'your_option_name' );
    $options = $this->sanitize_options( $options );

    if ( is_array( $saved_options ) && is_array( $options ) )
    {
        $options = array_merge( $saved_options, $options );
    }

    return $options;
}

    The sanitize_callback function is the one passed as an argument in your register_setting, and then you can use another one (named sanitize_options in my case) to do your sanitization.

    This sanitize_callback will take care of merging all the options under the same $option_name.

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