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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 |
---|---|
3068 |
|
3069 | /** |
3070 | * Filter the JOIN clause of the query. |
3071 | * |
3072 | * @since 1.5.0 |
3073 | * |
3074 | * @param string $where The JOIN clause of the query. |
3075 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
3076 | */ |
3077 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
3078 | } |
3079 |
|
3080 | // Paging |
3081 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
3082 | $page = absint($q['paged']); |
3083 | if ( !$page ) |
3084 | $page = 1; |
3085 |
|
3086 | if ( empty($q['offset']) ) { |