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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 |
|---|---|
| 1324 | |
| 1325 | /** |
| 1326 | * Filter the robots.txt output. |
| 1327 | * |
| 1328 | * @since 3.0.0 |
| 1329 | * |
| 1330 | * @param string $output Robots.txt output. |
| 1331 | * @param bool $public Whether the site is considered "public". |
| 1332 | */ |
| 1333 | echo apply_filters( 'robots_txt', $output, $public ); |
| 1334 | } |
| 1335 | |
| 1336 | /** |
| 1337 | * Test whether WordPress is already installed. |
| 1338 | * |
| 1339 | * The cache will be checked first. If you have a cache plugin, which saves |
| 1340 | * the cache values, then this will work. If you use the default WordPress |
| 1341 | * cache, and the database goes away, then you might have problems. |
| 1342 | * |