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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 |
|---|---|
| 1839 | $q = $this->fill_query_vars( $q ); |
| 1840 | |
| 1841 | /** |
| 1842 | * Filters whether an attachment query should include filenames or not. |
| 1843 | * |
| 1844 | * @since 6.0.3 |
| 1845 | * |
| 1846 | * @param bool $allow_query_attachment_by_filename Whether or not to include filenames. |
| 1847 | */ |
| 1848 | $this->allow_query_attachment_by_filename = apply_filters( 'wp_allow_query_attachment_by_filename', false ); |
| 1849 | remove_all_filters( 'wp_allow_query_attachment_by_filename' ); |
| 1850 | |
| 1851 | // Parse meta query. |
| 1852 | $this->meta_query = new WP_Meta_Query(); |
| 1853 | $this->meta_query->parse_query_vars( $q ); |
| 1854 | |
| 1855 | // Set a flag if a 'pre_get_posts' hook changed the query vars. |
| 1856 | $hash = md5( serialize( $this->query_vars ) ); |
| 1857 | if ( $hash != $this->query_vars_hash ) { |