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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 |
---|---|
2130 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
2131 | * |
2132 | * @return array List of posts. |
2133 | */ |
2134 | function get_posts() { |
2135 | global $wpdb; |
2136 |
|
2137 | $this->parse_query(); |
2138 |
|
2139 | do_action_ref_array('pre_get_posts', array(&$this)); |
2140 |
|
2141 | // Shorthand. |
2142 | $q = &$this->query_vars; |
2143 |
|
2144 | // Fill again in case pre_get_posts unset some vars. |
2145 | $q = $this->fill_query_vars($q); |
2146 |
|
2147 | // Parse meta query |
2148 | $this->meta_query = new WP_Meta_Query(); |