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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 |
---|---|
4063 | * |
4064 | * @since 4.7.4 |
4065 | * @since 4.8.0 The filter's default value is `true` rather than `null`. |
4066 | * |
4067 | * @link https://core.trac.wordpress.org/ticket/31071 |
4068 | * |
4069 | * @param bool|null $show Whether to show the button, or `null` to decide based |
4070 | * on whether any video files exist in the media library. |
4071 | */ |
4072 | $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true ); |
4073 | if ( null === $show_video_playlist ) { |
4074 | $show_video_playlist = $wpdb->get_var( |
4075 | " |
4076 | SELECT ID |
4077 | FROM $wpdb->posts |
4078 | WHERE post_type = 'attachment' |
4079 | AND post_mime_type LIKE 'video%' |
4080 | LIMIT 1 |
4081 | " |