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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 |
|---|---|
| 516 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 517 | if ( is_array( $notoptions ) && isset( $notoptions[$option_name] ) ) { |
| 518 | unset( $notoptions[$option_name] ); |
| 519 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |
| 520 | } |
| 521 | |
| 522 | $_newvalue = $newvalue; |
| 523 | $newvalue = maybe_serialize( $newvalue ); |
| 524 | |
| 525 | do_action( 'update_option', $option_name, $oldvalue, $newvalue ); |
| 526 | $alloptions = wp_load_alloptions(); |
| 527 | if ( isset( $alloptions[$option_name] ) ) { |
| 528 | $alloptions[$option_name] = $newvalue; |
| 529 | wp_cache_set( 'alloptions', $alloptions, 'options' ); |
| 530 | } else { |
| 531 | wp_cache_set( $option_name, $newvalue, 'options' ); |
| 532 | } |
| 533 | |
| 534 | $wpdb->update($wpdb->options, array('option_value' => $newvalue), array('option_name' => $option_name) ); |