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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 |
---|---|
2145 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
2146 | * |
2147 | * @return array List of posts. |
2148 | */ |
2149 | function get_posts() { |
2150 | global $wpdb; |
2151 |
|
2152 | $this->parse_query(); |
2153 |
|
2154 | do_action_ref_array('pre_get_posts', array(&$this)); |
2155 |
|
2156 | // Shorthand. |
2157 | $q = &$this->query_vars; |
2158 |
|
2159 | // Fill again in case pre_get_posts unset some vars. |
2160 | $q = $this->fill_query_vars($q); |
2161 |
|
2162 | // Parse meta query |
2163 | $this->meta_query = new WP_Meta_Query(); |