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
1411       *
1412       * @since 2.9.0 As 'pre_update_site_option_' . $key
1413       * @since 3.0.0
1414       * @since 4.4.0 The `$option` parameter was added
1415       *
1416       * @param mixed  $value     New value of the network option.
1417       * @param mixed  $old_value Old value of the network option.
1418       * @param string $option    Option name.
1419       */
1420      $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value, $option );
1421
1422      if ( $value === $old_value ) {
1423           return false;
1424      }
1425
1426      if ( false === $old_value ) {
1427           return add_network_option( $network_id, $option, $value );
1428      }
1429