How to create nested JSON objects in PHP?

The JSON structure can be created using the following code −

$json = json_encode(array(
   "client" => array(
      "build" => "1.0",
      "name" => "xxxx",
      "version" => "1.0"
   ),
   "protocolVersion" => 4,
   "data" => array(
      "distributorId" => "xxxx",
      "distributorPin" => "xxxx",
      "locale" => "en-US"
   )
));

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