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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 |
|---|---|
| 230 | // If the new and old values are the same, no need to update. |
| 231 | if ( $value === $old_value ) |
| 232 | return false; |
| 233 | |
| 234 | if ( false === $old_value ) |
| 235 | return add_option( $option, $value ); |
| 236 | |
| 237 | $serialized_value = maybe_serialize( $value ); |
| 238 | |
| 239 | do_action( 'update_option', $option, $old_value, $value ); |
| 240 | $result = $wpdb->update( $wpdb->options, array( 'option_value' => $serialized_value ), array( 'option_name' => $option ) ); |
| 241 | if ( ! $result ) |
| 242 | return false; |
| 243 | |
| 244 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 245 | if ( is_array( $notoptions ) && isset( $notoptions[$option] ) ) { |
| 246 | unset( $notoptions[$option] ); |
| 247 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |
| 248 | } |