Using WordPress ‘maybe_disable_link_manager()’ PHP function
Disables the Link Manager on upgrade if, at the time of upgrade, no links exist in the DB.
JavaScript
Using WordPress ‘print_footer_scripts()’ PHP function
Prints the scripts that were queued for the footer or too late for the HTML head.
Using WordPress ‘options_permalink_add_js()’ PHP function
The `options_permalink_add_js()` is a WordPress function that allows adding JavaScript code to a web page using the permalinks structure
Using Gravity Forms ‘gform_preview_header’ PHP filter
The `gform_preview_header` action hook in Gravity Forms allows developers to execute PHP code when the header of the form preview page loads