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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 |
|---|---|
| 261 | /** |
| 262 | * Filter an option before its value is (maybe) serialized and updated. |
| 263 | * |
| 264 | * @since 3.9.0 |
| 265 | * |
| 266 | * @param mixed $value The new, unserialized option value. |
| 267 | * @param string $option Name of the option. |
| 268 | * @param mixed $old_value The old option value. |
| 269 | */ |
| 270 | $value = apply_filters( 'pre_update_option', $value, $option, $old_value ); |
| 271 | |
| 272 | // If the new and old values are the same, no need to update. |
| 273 | if ( $value === $old_value ) |
| 274 | return false; |
| 275 | |
| 276 | /** This filter is documented in wp-includes/option.php */ |
| 277 | if ( apply_filters( 'default_option_' . $option, false ) === $old_value ) { |
| 278 | // Default setting for new options is 'yes'. |
| 279 | if ( null === $autoload ) { |