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
1529       * @since 3.0.0
1530       * @since 4.4.0 The `$option` parameter was added.
1531       * @since 4.7.0 The `$network_id` parameter was added.
1532       *
1533       * @param mixed  $value      New value of the network option.
1534       * @param mixed  $old_value  Old value of the network option.
1535       * @param string $option     Option name.
1536       * @param int    $network_id ID of the network.
1537       */
1538      $value = apply_filters( "pre_update_site_option_{$option}", $value, $old_value, $option, $network_id );
1539
1540      if ( $value === $old_value ) {
1541           return false;
1542      }
1543
1544      if ( false === $old_value ) {
1545           return add_network_option( $network_id, $option, $value );
1546      }
1547