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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 |
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1037 |
|
1038 | /** |
1039 | * Filter the default gallery shortcode CSS styles. |
1040 | * |
1041 | * @since 2.5.0 |
1042 | * |
1043 | * @param string $gallery_style Default gallery shortcode CSS styles. |
1044 | * @param string $gallery_div Opening HTML div container for the gallery shortcode output. |
1045 | */ |
1046 | $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div ); |
1047 |
|
1048 | $i = 0; |
1049 | foreach ( $attachments as $id => $attachment ) { |
1050 | if ( ! empty( $link ) && 'file' === $link ) |
1051 | $image_output = wp_get_attachment_link( $id, $size, false, false ); |
1052 | elseif ( ! empty( $link ) && 'none' === $link ) |
1053 | $image_output = wp_get_attachment_image( $id, $size, false ); |
1054 | else |
1055 | $image_output = wp_get_attachment_link( $id, $size, true, false ); |