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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 |
|---|---|
| 542 | if ( isset( $alloptions[$option_name] ) ) { |
| 543 | $alloptions[$option_name] = $newvalue; |
| 544 | wp_cache_set( 'alloptions', $alloptions, 'options' ); |
| 545 | } else { |
| 546 | wp_cache_set( $option_name, $newvalue, 'options' ); |
| 547 | } |
| 548 | |
| 549 | $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->options SET option_value = %s WHERE option_name = %s", $newvalue, $option_name ) ); |
| 550 | if ( $wpdb->rows_affected == 1 ) { |
| 551 | do_action( "update_option_{$option_name}", $oldvalue, $_newvalue ); |
| 552 | return true; |
| 553 | } |
| 554 | return false; |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * Add a new option. |
| 559 | * |
| 560 | * You do not need to serialize values, if the value needs to be serialize, then |