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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 |
|---|---|
| 298 | |
| 299 | if ( ! wp_installing() || ! is_multisite() ) { |
| 300 | /** |
| 301 | * Filters all options before caching them. |
| 302 | * |
| 303 | * @since 4.9.0 |
| 304 | * |
| 305 | * @param array $alloptions Array with all options. |
| 306 | */ |
| 307 | $alloptions = apply_filters( 'pre_cache_alloptions', $alloptions ); |
| 308 | |
| 309 | wp_cache_add( 'alloptions', $alloptions, 'options' ); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Filters all options after retrieving them. |
| 315 | * |
| 316 | * @since 4.9.0 |