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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 |
---|---|
1744 | * |
1745 | * Note: If using conditional tags, use the method versions within the passed instance |
1746 | * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions |
1747 | * like is_main_query() test against the global $wp_query instance, not the passed one. |
1748 | * |
1749 | * @since 2.0.0 |
1750 | * |
1751 | * @param WP_Query $this The WP_Query instance (passed by reference). |
1752 | */ |
1753 | do_action_ref_array( 'pre_get_posts', array( &$this ) ); |
1754 |
|
1755 | // Shorthand. |
1756 | $q = &$this->query_vars; |
1757 |
|
1758 | // Fill again in case pre_get_posts unset some vars. |
1759 | $q = $this->fill_query_vars( $q ); |
1760 |
|
1761 | // Parse meta query |
1762 | $this->meta_query = new WP_Meta_Query(); |