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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 |
|---|---|
| 3183 | |
| 3184 | /** |
| 3185 | * Filter the ORDER BY clause of the query. |
| 3186 | * |
| 3187 | * @since 1.5.1 |
| 3188 | * |
| 3189 | * @param string $orderby The ORDER BY clause of the query. |
| 3190 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3191 | */ |
| 3192 | $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); |
| 3193 | |
| 3194 | /** |
| 3195 | * Filter the DISTINCT clause of the query. |
| 3196 | * |
| 3197 | * @since 2.1.0 |
| 3198 | * |
| 3199 | * @param string $distinct The DISTINCT clause of the query. |
| 3200 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3201 | */ |