Add a callback to a WordPress action or filterFilterFilters are one of the two types of Hooks https://codex.wordpress.org/Plugin_API/Hooks. They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output..
$tag (string) Named WordPress action or filter. $function_to_add (mixed) Callable to execute when the action or filter is evaluated. $priority (integer) Priority to add the callback as. $accepted_args (integer) Number of arguments to pass to callback. @return (true)
add_action() without needing access to add_action(). If WordPress is
already loaded though, you should use add_action() (and add_filter())
Internal APIAPIAn API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. documentation is generated from the WP-CLIWP-CLIWP-CLI is the Command Line Interface for WordPress, used to do administrative and development tasks in a programmatic way. The project page is http://wp-cli.org/https://make.wordpress.org/cli/ codebase on every release. To suggest improvements, please submit a pull request.