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  Displaying PHP Handler Usage
Use the get-usage operation to enable the specified PHP handler. Use filters to specify the handler by its ID.
Request Packet Structure
A request XML packet that enables a PHP handler includes the get-usage operation node:
<packet>
  <get-usage>
      ...
  </get-usage>
</packet>
The get-usage node is presented by the PhpHandlerInputType type
(php_handler.xsd), and its graphical representation is as follows:

Note: The interactive schema navigator for all request packets is available here: http://plesk.github.io/api-schemas/1.6.8.0/agent_input.svg.
- The filter node is required. It specifies the filtering rule.
Data type: PhpHandlerFilter (php_handler.xsd) .
Request Sample
<packet>
  <php-handler>
    <get-usage>
        <filter>
          <id>fastcgi</id>
        </filter>
    </get-usage>
  </php-handler>
</packet>