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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 |
|---|---|
| 271 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 272 | * |
| 273 | * @since 2.6.0 |
| 274 | * @since 4.4.0 The `$option` parameter was added. |
| 275 | * |
| 276 | * @param mixed $value The new, unserialized option value. |
| 277 | * @param mixed $old_value The old option value. |
| 278 | * @param string $option Option name. |
| 279 | */ |
| 280 | $value = apply_filters( 'pre_update_option_' . $option, $value, $old_value, $option ); |
| 281 | |
| 282 | /** |
| 283 | * Filter an option before its value is (maybe) serialized and updated. |
| 284 | * |
| 285 | * @since 3.9.0 |
| 286 | * |
| 287 | * @param mixed $value The new, unserialized option value. |
| 288 | * @param string $option Name of the option. |
| 289 | * @param mixed $old_value The old option value. |