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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) ); |