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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 |
|---|---|
| 990 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 991 | * |
| 992 | * @since 2.0.1 |
| 993 | * @since 4.4.0 The `$option` parameter was added. |
| 994 | * |
| 995 | * @param mixed $old_value The old option value. |
| 996 | * @param mixed $value The new option value. |
| 997 | * @param string $option Option name. |
| 998 | */ |
| 999 | do_action( "update_option_{$option}", $old_value, $value, $option ); |
| 1000 | |
| 1001 | /** |
| 1002 | * Fires after the value of an option has been successfully updated. |
| 1003 | * |
| 1004 | * @since 2.9.0 |
| 1005 | * |
| 1006 | * @param string $option Name of the updated option. |
| 1007 | * @param mixed $old_value The old option value. |
| 1008 | * @param mixed $value The new option value. |