Using WordPress ‘display_header()’ PHP function
The `display_header()` function in WordPress adds the installation header with optional body classes passed as a parameter
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Using WordPress ‘core_update_footer()’ PHP function
The `core_update_footer()` function displays a message in the WordPress admin footer about the core update status of the installation
Using WordPress ‘filter_SSL()’ PHP function
Learn how to use the filter_SSL() function in WordPress to format URLs as https
Using WordPress ‘has_action()’ PHP function
Checks if any action has been registered for a hook.