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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 |
|---|---|
| 923 | * the default gallery template. |
| 924 | * |
| 925 | * @since 2.5.0 |
| 926 | * |
| 927 | * @see gallery_shortcode() |
| 928 | * |
| 929 | * @param string $output The gallery output. Default empty. |
| 930 | * @param array $attr Attributes of the gallery shortcode. |
| 931 | */ |
| 932 | $output = apply_filters( 'post_gallery', '', $attr ); |
| 933 | if ( $output != '' ) |
| 934 | return $output; |
| 935 | |
| 936 | // We're trusting author input, so let's at least make sure it looks like a valid orderby statement |
| 937 | if ( isset( $attr['orderby'] ) ) { |
| 938 | $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] ); |
| 939 | if ( !$attr['orderby'] ) |
| 940 | unset( $attr['orderby'] ); |
| 941 | } |