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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 |
|---|---|
| 800 | * |
| 801 | * This filter runs before it can be used by plugins. It is designed for non-web |
| 802 | * runtimes. If false is returned, object-cache.php will never be loaded. |
| 803 | * |
| 804 | * @since 5.8.0 |
| 805 | * |
| 806 | * @param bool $enable_object_cache Whether to enable loading object-cache.php (if present). |
| 807 | * Default true. |
| 808 | */ |
| 809 | if ( $first_init && apply_filters( 'enable_loading_object_cache_dropin', true ) ) { |
| 810 | if ( ! function_exists( 'wp_cache_init' ) ) { |
| 811 | /* |
| 812 | * This is the normal situation. First-run of this function. No |
| 813 | * caching backend has been loaded. |
| 814 | * |
| 815 | * We try to load a custom caching backend, and then, if it |
| 816 | * results in a wp_cache_init() function existing, we note |
| 817 | * that an external object cache is being used. |
| 818 | */ |