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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 |
|---|---|
| 3227 | |
| 3228 | /** |
| 3229 | * Filter the DISTINCT clause of the query. |
| 3230 | * |
| 3231 | * @since 2.1.0 |
| 3232 | * |
| 3233 | * @param string $distinct The DISTINCT clause of the query. |
| 3234 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3235 | */ |
| 3236 | $distinct = apply_filters_ref_array( 'posts_distinct', array( $distinct, &$this ) ); |
| 3237 | |
| 3238 | /** |
| 3239 | * Filter the LIMIT clause of the query. |
| 3240 | * |
| 3241 | * @since 2.1.0 |
| 3242 | * |
| 3243 | * @param string $limits The LIMIT clause of the query. |
| 3244 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3245 | */ |