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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 |
|---|---|
| 3375 | * Filter the LIMIT clause of the query. |
| 3376 | * |
| 3377 | * For use by caching plugins. |
| 3378 | * |
| 3379 | * @since 2.5.0 |
| 3380 | * |
| 3381 | * @param string $limits The LIMIT clause of the query. |
| 3382 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3383 | */ |
| 3384 | $limits = apply_filters_ref_array( 'post_limits_request', array( $limits, &$this ) ); |
| 3385 | |
| 3386 | /** |
| 3387 | * Filter all query clauses at once, for convenience. |
| 3388 | * |
| 3389 | * For use by caching plugins. |
| 3390 | * |
| 3391 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 3392 | * fields (SELECT), and LIMITS clauses. |
| 3393 | * |