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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 |
---|---|
804 | * |
805 | * This filter runs before it can be used by plugins. It is designed for non-web |
806 | * runtimes. If false is returned, object-cache.php will never be loaded. |
807 | * |
808 | * @since 5.8.0 |
809 | * |
810 | * @param bool $enable_object_cache Whether to enable loading object-cache.php (if present). |
811 | * Default true. |
812 | */ |
813 | if ( $first_init && apply_filters( 'enable_loading_object_cache_dropin', true ) ) { |
814 | if ( ! function_exists( 'wp_cache_init' ) ) { |
815 | /* |
816 | * This is the normal situation. First-run of this function. No |
817 | * caching backend has been loaded. |
818 | * |
819 | * We try to load a custom caching backend, and then, if it |
820 | * results in a wp_cache_init() function existing, we note |
821 | * that an external object cache is being used. |
822 | */ |