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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 4787 | |
| 4788 | if ( empty( $internal_hosts ) ) { |
| 4789 | /** |
| 4790 | * Filters the array of URL hosts which are considered internal. |
| 4791 | * |
| 4792 | * @since 6.2.0 |
| 4793 | * |
| 4794 | * @param string[] $internal_hosts An array of internal URL hostnames. |
| 4795 | */ |
| 4796 | $internal_hosts = apply_filters( |
| 4797 | 'wp_internal_hosts', |
| 4798 | array( |
| 4799 | wp_parse_url( home_url(), PHP_URL_HOST ), |
| 4800 | ) |
| 4801 | ); |
| 4802 | $internal_hosts = array_unique( |
| 4803 | array_map( 'strtolower', (array) $internal_hosts ) |
| 4804 | ); |
| 4805 | } |