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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 |
|---|---|
| 279 | /** |
| 280 | * Filter an option before its value is (maybe) serialized and updated. |
| 281 | * |
| 282 | * @since 3.9.0 |
| 283 | * |
| 284 | * @param mixed $value The new, unserialized option value. |
| 285 | * @param string $option Name of the option. |
| 286 | * @param mixed $old_value The old option value. |
| 287 | */ |
| 288 | $value = apply_filters( 'pre_update_option', $value, $option, $old_value ); |
| 289 | |
| 290 | // If the new and old values are the same, no need to update. |
| 291 | if ( $value === $old_value ) |
| 292 | return false; |
| 293 | |
| 294 | /** This filter is documented in wp-includes/option.php */ |
| 295 | if ( apply_filters( 'default_option_' . $option, false ) === $old_value ) { |
| 296 | // Default setting for new options is 'yes'. |
| 297 | if ( null === $autoload ) { |