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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 |
|---|---|
| 592 | * @since 2.5.0 |
| 593 | * |
| 594 | * @param array $attr Attributes attributed to the shortcode. |
| 595 | * @return string HTML content to display gallery. |
| 596 | */ |
| 597 | function gallery_shortcode($attr) { |
| 598 | global $post; |
| 599 | |
| 600 | // Allow plugins/themes to override the default gallery template. |
| 601 | $output = apply_filters('post_gallery', '', $attr); |
| 602 | if ( $output != '' ) |
| 603 | return $output; |
| 604 | |
| 605 | // We're trusting author input, so let's at least make sure it looks like a valid orderby statement |
| 606 | if ( isset( $attr['orderby'] ) ) { |
| 607 | $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] ); |
| 608 | if ( !$attr['orderby'] ) |
| 609 | unset( $attr['orderby'] ); |
| 610 | } |