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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 |
|---|---|
| 3305 | * Filter the WHERE clause of the query. |
| 3306 | * |
| 3307 | * Specifically for manipulating paging queries. |
| 3308 | * |
| 3309 | * @since 1.5.0 |
| 3310 | * |
| 3311 | * @param string $where The WHERE clause of the query. |
| 3312 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3313 | */ |
| 3314 | $where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) ); |
| 3315 | |
| 3316 | /** |
| 3317 | * Filter the GROUP BY clause of the query. |
| 3318 | * |
| 3319 | * @since 2.0.0 |
| 3320 | * |
| 3321 | * @param string $groupby The GROUP BY clause of the query. |
| 3322 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3323 | */ |