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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 |
|---|---|
| 1243 | /** |
| 1244 | * Display the date on which the post was last modified. |
| 1245 | * |
| 1246 | * @since 2.1.0 |
| 1247 | * |
| 1248 | * @param string $d Optional. PHP date format. |
| 1249 | * @return string |
| 1250 | */ |
| 1251 | function the_modified_date($d = '') { |
| 1252 | echo apply_filters('the_modified_date', get_the_modified_date($d), $d); |
| 1253 | } |
| 1254 | |
| 1255 | /** |
| 1256 | * Retrieve the date on which the post was last modified. |
| 1257 | * |
| 1258 | * @since 2.1.0 |
| 1259 | * |
| 1260 | * @param string $d Optional. PHP date format. Defaults to the "date_format" option |
| 1261 | * @return string |