You have not defined a function called display_facebook_element, at least you did not include that in the code posted. Thus, you are getting the error. display_facebook_element isn’t a valid callback. It doesn’t exist.
in register_settings you need to pass the names of the options you use. right now it seems like you left that call the same as from wherever you copy & pasted it (not criticizing at all here). If you need two options (why?) then you need to call it twice, once for each option. The … Read more
[*] The problem with the code sample is that the setting is using widget_ as the prefix. This is a reserved prefix for widgets, per the customizer handbook: Important: Do not use a setting ID that looks like widget_*, sidebars_widgets[*], nav_menu[*], or nav_menu_item[*]. These setting ID patterns are reserved for widget instances, sidebars, nav menus, … Read more
As discussed in the WordPress Support Forums, in some instances, it’s easier to develop an array which stores the value value. To group the checkboxes, I simply copied the same format from the Discussion settings page to get my expected result: a group of checkboxes that are formatted using WordPress’ native style. Here’s a good … Read more
You are registering user_profile_template function to run during the page_template filter hook, but your function is actually called registration_template. This is why your selected page might not be loading your custom template file. That’s one thing. Another is that with this method, the selected page will look completely different than all other page in the … Read more
Can’t save multiple sections on one page with register_setting
Create settings field on button click
Because your options are stored in one overarching serialized option, you have to make a function like below to retrieve the right option. <?php function get_contact_details_setting( $option ) { $contact_details_settings = unserialize( get_option( ‘contact_details_settings’ ) ); return $contact_details_settings[$option]; } ?>
User specific settings, limited by role
That is a Panel, the customizer contains three layers: panels contain sections, sections contain settings, and settings are the data that gets managed by the controls in the customizer UI. [panel] |–[section] | |–[setting] and his [control] | |–[setting] and his [control] |–[section] | |–[setting] and his [control] | |–[setting] and his [control] Panel, Section, … Read more