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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 |
|---|---|
| 400 | $_newvalue = $newvalue; |
| 401 | $newvalue = maybe_serialize($newvalue); |
| 402 | |
| 403 | wp_cache_set($option_name, $newvalue, 'options'); |
| 404 | |
| 405 | $newvalue = $wpdb->escape($newvalue); |
| 406 | $option_name = $wpdb->escape($option_name); |
| 407 | $wpdb->query("UPDATE $wpdb->options SET option_value = '$newvalue' WHERE option_name = '$option_name'"); |
| 408 | if ( $wpdb->rows_affected == 1 ) { |
| 409 | do_action("update_option_{$option_name}", array('old'=>$oldvalue, 'new'=>$_newvalue)); |
| 410 | return true; |
| 411 | } |
| 412 | return false; |
| 413 | } |
| 414 | |
| 415 | function update_user_option( $user_id, $option_name, $newvalue, $global = false ) { |
| 416 | global $wpdb; |
| 417 | if ( !$global ) |
| 418 | $option_name = $wpdb->prefix . $option_name; |