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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 |
---|---|
4150 | * |
4151 | * @since 4.7.4 |
4152 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
4153 | * |
4154 | * @link https://core.trac.wordpress.org/ticket/31071 |
4155 | * |
4156 | * @param bool|null $show Whether to show the button, or `null` to decide based |
4157 | * on whether any video files exist in the media library. |
4158 | */ |
4159 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
4160 | if ( null === $show_video_playlist ) { |
4161 | $show_video_playlist = $wpdb->get_var( |
4162 | " |
4163 | SELECT ID |
4164 | FROM $wpdb->posts |
4165 | WHERE post_type = 'attachment' |
4166 | AND post_mime_type LIKE 'video%' |
4167 | LIMIT 1 |
4168 | " |