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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 |
|---|---|
| 2437 | |
| 2438 | /** |
| 2439 | * Filters the default gallery shortcode CSS styles. |
| 2440 | * |
| 2441 | * @since 2.5.0 |
| 2442 | * |
| 2443 | * @param string $gallery_style Default CSS styles and opening HTML div container |
| 2444 | * for the gallery shortcode output. |
| 2445 | */ |
| 2446 | $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div ); |
| 2447 | |
| 2448 | $i = 0; |
| 2449 | |
| 2450 | foreach ( $attachments as $id => $attachment ) { |
| 2451 | |
| 2452 | $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : ''; |
| 2453 | |
| 2454 | if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) { |
| 2455 | $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr ); |