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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 |
|---|---|
| 3207 | * Filter the JOIN clause of the query. |
| 3208 | * |
| 3209 | * Specifically for manipulating paging queries. |
| 3210 | * |
| 3211 | * @since 1.5.0 |
| 3212 | * |
| 3213 | * @param string $join The JOIN clause of the query. |
| 3214 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3215 | */ |
| 3216 | $join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) ); |
| 3217 | |
| 3218 | /** |
| 3219 | * Filter the ORDER BY clause of the query. |
| 3220 | * |
| 3221 | * @since 1.5.1 |
| 3222 | * |
| 3223 | * @param string $orderby The ORDER BY clause of the query. |
| 3224 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3225 | */ |