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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 |
---|---|
3048 |
|
3049 | /** |
3050 | * Filter the JOIN clause of the query. |
3051 | * |
3052 | * @since 1.5.0 |
3053 | * |
3054 | * @param string $where The JOIN clause of the query. |
3055 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
3056 | */ |
3057 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
3058 | } |
3059 |
|
3060 | // Paging |
3061 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
3062 | $page = absint($q['paged']); |
3063 | if ( !$page ) |
3064 | $page = 1; |
3065 |
|
3066 | if ( empty($q['offset']) ) { |