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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 |
|---|---|
| 1175 | * |
| 1176 | * Passing a non-empty value to the filter will short-circuit generation |
| 1177 | * of the default playlist output, returning the passed value instead. |
| 1178 | * |
| 1179 | * @since 3.9.0 |
| 1180 | * |
| 1181 | * @param string $output Playlist output. Default empty. |
| 1182 | * @param array $attr An array of shortcode attributes. |
| 1183 | */ |
| 1184 | $output = apply_filters( 'post_playlist', '', $attr ); |
| 1185 | if ( $output != '' ) { |
| 1186 | return $output; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * We're trusting author input, so let's at least make sure it looks |
| 1191 | * like a valid orderby statement. |
| 1192 | */ |
| 1193 | if ( isset( $attr['orderby'] ) ) { |