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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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2215 |
|
2216 | // Apply post-paging filters on where and join. Only plugins that |
2217 | // manipulate paging queries should use these hooks. |
2218 | if ( !$q['suppress_filters'] ) { |
2219 | $where = apply_filters('posts_where_paged', $where); |
2220 | $groupby = apply_filters('posts_groupby', $groupby); |
2221 | $join = apply_filters('posts_join_paged', $join); |
2222 | $orderby = apply_filters('posts_orderby', $orderby); |
2223 | $distinct = apply_filters('posts_distinct', $distinct); |
2224 | $limits = apply_filters( 'post_limits', $limits ); |
2225 |
|
2226 | $fields = apply_filters('posts_fields', $fields); |
2227 | } |
2228 |
|
2229 | // Announce current selection parameters. For use by caching plugins. |
2230 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
2231 |
|
2232 | // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above. |
2233 | if ( !$q['suppress_filters'] ) { |