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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 |
|---|---|
| 3280 | /** |
| 3281 | * Fires to announce the query's current selection parameters. |
| 3282 | * |
| 3283 | * For use by caching plugins. |
| 3284 | * |
| 3285 | * @since 2.3.0 |
| 3286 | * |
| 3287 | * @param string $selection The assembled selection query. |
| 3288 | */ |
| 3289 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 3290 | |
| 3291 | /* |
| 3292 | * Filter again for the benefit of caching plugins. |
| 3293 | * Regular plugins should use the hooks above. |
| 3294 | */ |
| 3295 | if ( !$q['suppress_filters'] ) { |
| 3296 | /** |
| 3297 | * Filter the WHERE clause of the query. |
| 3298 | * |