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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 |
|---|---|
| 1233 | |
| 1234 | /** |
| 1235 | * Filter the robots.txt output. |
| 1236 | * |
| 1237 | * @since 3.0.0 |
| 1238 | * |
| 1239 | * @param string $output Robots.txt output. |
| 1240 | * @param bool $public Whether the site is considered "public". |
| 1241 | */ |
| 1242 | echo apply_filters( 'robots_txt', $output, $public ); |
| 1243 | } |
| 1244 | |
| 1245 | /** |
| 1246 | * Test whether blog is already installed. |
| 1247 | * |
| 1248 | * The cache will be checked first. If you have a cache plugin, which saves |
| 1249 | * the cache values, then this will work. If you use the default WordPress |
| 1250 | * cache, and the database goes away, then you might have problems. |
| 1251 | * |