Source View: pre_update_site_option_{$option}

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

Line Code
1187       *
1188       * The dynamic portion of the hook name, $option, refers to the option name.
1189       *
1190       * @since 2.9.0 As 'pre_update_site_option_' . $key
1191       * @since 3.0.0
1192       *
1193       * @param mixed $value     New value of site option.
1194       * @param mixed $old_value Old value of site option.
1195       */
1196      $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value );
1197
1198      if ( $value === $old_value )
1199           return false;
1200
1201      if ( false === $old_value )
1202           return add_site_option( $option, $value );
1203
1204      $notoptions_key = "{$wpdb->siteid}:notoptions";
1205      $notoptions = wp_cache_get( $notoptions_key, 'site-options' );