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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 |
|---|---|
| 3151 | * Filter the WHERE clause of the query. |
| 3152 | * |
| 3153 | * Specifically for manipulating paging queries. |
| 3154 | * |
| 3155 | * @since 1.5.0 |
| 3156 | * |
| 3157 | * @param string $where The WHERE clause of the query. |
| 3158 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3159 | */ |
| 3160 | $where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) ); |
| 3161 | |
| 3162 | /** |
| 3163 | * Filter the GROUP BY clause of the query. |
| 3164 | * |
| 3165 | * @since 2.0.0 |
| 3166 | * |
| 3167 | * @param string $groupby The GROUP BY clause of the query. |
| 3168 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3169 | */ |