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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 |
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2537 |
|
2538 | /** |
2539 | * Filters the JOIN clause of the query. |
2540 | * |
2541 | * @since 1.5.0 |
2542 | * |
2543 | * @param string $join The JOIN clause of the query. |
2544 | * @param WP_Query $this The WP_Query instance (passed by reference). |
2545 | */ |
2546 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
2547 | } |
2548 |
|
2549 | // Paging |
2550 | if ( empty( $q['nopaging'] ) && ! $this->is_singular ) { |
2551 | $page = absint( $q['paged'] ); |
2552 | if ( ! $page ) { |
2553 | $page = 1; |
2554 | } |
2555 |
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