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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 |
---|---|
1795 | * |
1796 | * Note: If using conditional tags, use the method versions within the passed instance |
1797 | * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions |
1798 | * like is_main_query() test against the global $wp_query instance, not the passed one. |
1799 | * |
1800 | * @since 2.0.0 |
1801 | * |
1802 | * @param WP_Query $query The WP_Query instance (passed by reference). |
1803 | */ |
1804 | do_action_ref_array( 'pre_get_posts', array( &$this ) ); |
1805 |
|
1806 | // Shorthand. |
1807 | $q = &$this->query_vars; |
1808 |
|
1809 | // Fill again in case 'pre_get_posts' unset some vars. |
1810 | $q = $this->fill_query_vars( $q ); |
1811 |
|
1812 | // Parse meta query. |
1813 | $this->meta_query = new WP_Meta_Query(); |