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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 |
|---|---|
| 914 | /** |
| 915 | * Fires immediately before an option value is updated. |
| 916 | * |
| 917 | * @since 2.9.0 |
| 918 | * |
| 919 | * @param string $option Name of the option to update. |
| 920 | * @param mixed $old_value The old option value. |
| 921 | * @param mixed $value The new option value. |
| 922 | */ |
| 923 | do_action( 'update_option', $option, $old_value, $value ); |
| 924 | |
| 925 | $update_args = array( |
| 926 | 'option_value' => $serialized_value, |
| 927 | ); |
| 928 | |
| 929 | if ( null !== $autoload ) { |
| 930 | $update_args['autoload'] = wp_determine_option_autoload_value( $option, $value, $serialized_value, $autoload ); |
| 931 | } else { |
| 932 | // Retrieve the current autoload value to reevaluate it in case it was set automatically. |