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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 |
|---|---|
| 1901 | * |
| 1902 | * Note: If using conditional tags, use the method versions within the passed instance |
| 1903 | * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions |
| 1904 | * like is_main_query() test against the global $wp_query instance, not the passed one. |
| 1905 | * |
| 1906 | * @since 2.0.0 |
| 1907 | * |
| 1908 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 1909 | */ |
| 1910 | do_action_ref_array( 'pre_get_posts', array( &$this ) ); |
| 1911 | |
| 1912 | // Locally scoped reference for easy of use. |
| 1913 | $query_vars = &$this->query_vars; |
| 1914 | |
| 1915 | // Fill again in case 'pre_get_posts' unset some vars. |
| 1916 | $query_vars = $this->fill_query_vars( $query_vars ); |
| 1917 | |
| 1918 | /** |
| 1919 | * Filters whether an attachment query should include filenames or not. |