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I'm looking for some help on how to add a new value to serialized data in WordPress. I'm trying to add a new option to an already installed plugin so I can add extra functionality for the client and I need to add "price_higher_rates" to wp_estate_submission_page_fields array in wprentals_admin.

As I'm new to developing for WordPress I've tried adding the data directly into the database but I then I got some errors which is when I found that the data is seralized. I've seen the functions add_option() and update_option() but cant find how to add the new value.

This is a snippet on the wprentals_admin perceptually the wp_estate_submission_page_fields array

s:32:"wp_estate_submission_page_fields";a:40:{i:0;s:20:"prop_category_submit";i:1;s:27:"prop_action_category_submit";i:2;s:19:"property_city_front";i:3;s:19:"property_area_front";i:4;s:20:"property_description";i:5;s:14:"property_price";i:6;s:14:"property_taxes";i:7;s:23:"property_price_per_week";i:8;s:24:"property_price_per_month";i:9;s:18:"price_per_weekeend";i:10;s:12:"cleaning_fee";i:11;s:8:"city_fee";i:12;s:16:"min_days_booking";i:13;s:16:"security_deposit";i:14;s:18:"early_bird_percent";i:15;s:21:"extra_price_per_guest";i:16;s:19:"checkin_change_over";i:17;s:28:"checkin_checkout_change_over";i:18;s:13:"extra_options";i:19;s:13:"custom_prices";i:20;s:8:"attachid";i:21;s:14:"embed_video_id";i:22;s:16:"embed_video_type";i:23;s:13:"property_size";i:24;s:14:"property_rooms";i:25;s:18:"property_bathrooms";i:26;s:16:"property_address";i:27;s:12:"property_zip";i:28;s:15:"property_county";i:29;s:14:"property_state";i:30;s:12:"property_map";i:31;s:17:"property_latitude";i:32;s:18:"property_longitude";i:33;s:19:"google_camera_angle";i:34;s:15:"individual-work";i:35;s:14:"client-meeting";i:36;s:12:"team-meeting";i:37;s:4:"wifi";i:38;s:13:"flatscreen-tv";i:39;s:9:"flipchart";}

Full table value

a:411:{s:8:"last_tab";s:1:"1";s:25:"wp_estate_general_country";s:14:"United Kingdom";s:21:"wp_estate_measure_sys";s:2:"ft";s:26:"wp_estate_enable_user_pass";s:3:"yes";s:24:"wp_estate_separate_users";s:3:"yes";s:22:"wp_estate_publish_only";s:17:"Connect";s:23:"wp_estate_delete_orphan";s:3:"yes";s:19:"wp_estate_date_lang";s:5:"en-GB";s:29:"wp_estate_disable_theme_cache";s:2:"no";s:31:"wp_estate_google_analytics_code";s:0:"";s:21:"wp_estate_wide_status";s:1:"1";s:17:"wp_estate_prop_no";s:1:"6";s:22:"wp_estate_blog_sidebar";s:10:"no sidebar";s:27:"wp_estate_blog_sidebar_name";s:19:"primary-widget-area";s:28:"wp_estate_property_list_type";s:1:"1";s:32:"wp_estate_property_list_type_adv";s:1:"2";s:23:"wp_estate_favicon_image";a:5:{s:3:"url";s:81:"";s:2:"id";s:5:"30153";s:6:"height";s:2:"64";s:5:"width";s:2:"64";s:9:"thumbnail";s:81:"";}s:20:"wp_estate_logo_image";a:5:{s:3:"url";s:82:"";s:2:"id";s:5:"30179";s:6:"height";s:3:"109";s:5:"width";s:3:"441";s:9:"thumbnail";s:90:"";}s:32:"wp_estate_transparent_logo_image";a:5:{s:3:"url";s:82:";s:2:"id";s:5:"30179";s:6:"height";s:3:"109";s:5:"width";s:3:"441";s:9:"thumbnail";s:90:"";}s:27:"wp_estate_mobile_logo_image";a:5:{s:3:"url";s:82:"";s:2:"id";s:5:"30179";s:6:"height";s:3:"109";s:5:"width";s:3:"441";s:9:"thumbnail";s:90:"";}s:27:"wp_estate_logo_image_retina";a:5:{s:3:"url";s:0:"";s:2:"id";s:0:"";s:6:"height";s:0:"";s:5:"width";s:0:"";s:9:"thumbnail";s:0:"";}s:39:"wp_estate_transparent_logo_image_retina";a:5:{s:3:"url";s:0:"";s:2:"id";s:0:"";s:6:"height";s:0:"";s:5:"width";s:0:"";s:9:"thumbnail";s:0:"";}s:34:"wp_estate_mobile_logo_image_retina";a:5:{s:3:"url";s:0:"";s:2:"id";s:0:"";s:6:"height";s:0:"";s:5:"width";s:0:"";s:9:"thumbnail";s:0:"";}s:32:"wp_estate_show_top_bar_user_menu";s:2:"no";s:34:"wp_estate_show_top_bar_mobile_menu";s:2:"no";s:21:"wp_estate_show_submit";s:2:"no";s:33:"wp_estate_show_top_bar_user_login";s:3:"yes";s:29:"wp_estate_show_menu_dashboard";s:3:"yes";s:26:"wp_estate_logo_header_type";s:5:"type1";s:27:"wp_estate_logo_header_align";s:4:"left";s:21:"wp_estate_header_type";s:1:"4";s:26:"wp_estate_user_header_type";s:1:"0";s:34:"wp_estate_global_revolution_slider";s:0:"";s:23:"wp_estate_global_header";a:5:{s:3:"url";s:0:"";s:2:"id";s:0:"";s:6:"height";s:0:"";s:5:"width";s:0:"";s:9:"thumbnail";s:0:"";}s:24:"wp_estate_paralax_header";s:3:"yes";s:29:"wp_estate_use_upload_tax_page";s:3:"yes";s:21:"wp_estate_wide_header";s:3:"yes";s:26:"wp_estate_transparent_menu";s:2:"no";s:34:"wp_estate_transparent_menu_listing";s:2:"no";s:27:"wp_estate_footer_background";a:5:{s:3:"url";s:0:"";s:2:"id";s:0:"";s:6:"height";s:0:"";s:5:"width";s:0:"";s:9:"thumbnail";s:0:"";}s:28:"wp_estate_repeat_footer_back";s:9:"no repeat";s:21:"wp_estate_wide_footer";s:2:"no";s:27:"wp_estate_copyright_message";s:37:"COPYRIGHT © 2019 ALL RIGHTS RESERVED";s:29:"wp_estate_prices_th_separator";s:1:",";s:29:"wp_estate_currency_label_main";s:2:"£";s:31:"wp_estate_where_currency_symbol";s:6:"before";s:25:"wp_estate_currency_symbol";s:3:"GBP";s:22:"wp_estate_auto_curency";s:3:"yes";s:34:"wp_estate_currencyconverterapi_api";s:0:"";s:22:"wp_estate_booking_type";s:1:"3";s:23:"wp_estate_setup_weekend";s:1:"0";s:21:"wp_estate_date_format";s:1:"2";s:27:"wp_estate_guest_dropdown_no";s:2:"50";s:23:"wp_estate_month_no_show";s:2:"24";s:27:"wpestate_custom_fields_list";a:5:{s:14:"add_field_name";a:3:{i:0;s:15:"Individual Work";i:1;s:14:"Client Meeting";i:2;s:12:"Team Meeting";}s:15:"add_field_label";a:3:{i:0;s:24:"Good for Individual Work";i:1;s:14:"Client Meeting";i:2;s:12:"Team Meeting";}s:15:"add_field_order";a:3:{i:0;s:1:"1";i:1;s:1:"2";i:2;s:1:"4";}s:14:"add_field_type";a:3:{i:0;s:8:"dropdown";i:1;s:8:"dropdown";i:2;s:8:"dropdown";}s:18:"add_dropdown_order";a:3:{i:0;s:7:"Yes, No";i:1;s:7:"Yes, No";i:2;s:7:"Yes, No";}}s:22:"wp_estate_feature_list";s:155:"WiFi,

Thank You

4
  • 1
    Hey monkeyman, welcome to WordPress development. It's a bit unclear to me what exactly you are trying to achieve. Extend a contrib or premium or custom plugin? Have you already read about codex.wordpress.org/Function_Reference/add_option and scanned the core for the mentioned functions?
    – leymannx
    Apr 2, 2019 at 13:58
  • Does it have to be a part of the option and not a new additional option?
    – Tom J Nowell
    Apr 2, 2019 at 14:23
  • Hi, sorry, so i can use add_option() and create a new table row called wp_estate_submission_page_fields with the value "price_higher_rates" , What i want to do is add "price_higher_rates" to a row called wprentals_admin but i want to add "price_higher_rates" to an specific array already in wprentals_admin. Apr 2, 2019 at 14:24
  • @TomJNowell Hi Tom, It needs to be part of the the option and not a new one. Thanks Apr 2, 2019 at 14:30

1 Answer 1

3

Options store plaintext text/string values, they don't store structured data, which is what the plugin is trying to do.

Storing structured data involves turning it into a plaintext string which introduces lots of security and maintenance problems. WordPress did this to make development easier in the early days and is now stuck with this system.

You won't find any WordPress APIs that let you partially update or add to that serialised value, but you can deserialise it, modify it with standard PHP language stuff, then serialise it again. A bit like removing a box, putting something new in it, then putting it back where you found it.

$serialised = get_option( 'foobar' );
$data = maybe_unserialize( $serialised );
// .. do something with $data
update_option( 'foobar', serialize( $data ) );

How might you modify it? The same way you would any other PHP array or object, e.g.:

// if this was $data
$data = [ 1,2,3,4,5];
// then lets add a 6th item to the array
$data[] = 6

As for the specifics of this plugin/themes stored data, you'd have to contact them if you encounter issues or refer to their documentation

1
  • Okay, thank you for pointing me in the right direction. I think its my lack of WordPress knowledge has tripped me up here. This should get me going again. Thanks again Apr 2, 2019 at 14:36

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