Amazon Echo PHP file to control Honeywell Thermostat through a python script

echo.php

<?php

//https://www.ourace.com/145-amazon-echo-alexa-with-php-hello-world

$EchoJArray = json_decode(file_get_contents('php://input'));
$RequestType = $EchoJArray->request->type;

$JsonOut 	= GetJsonMessageResponse($RequestType,$EchoJArray);
$size 		= strlen($JsonOut);
header('Content-Type: application/json');
header("Content-length: $size");
echo $JsonOut;


function GetJsonMessageResponse($RequestMessageType,$EchoJArray){

  // Variable to confirm everything was successful;
  $pass = True;

  // ******************** Get action ********************;
  $action = $EchoJArray->request->intent->slots->action->value;
  if(empty($action)) {
    $action = "cool";
  }
  
  // ******************** Get the temperature ********************;
  $temp = $EchoJArray->request->intent->slots->temp->value;
  if(empty($temp) and (($action == "cool") or ($action == "heat"))) {
    $pass = False;
    $text_response = "Error: Temperature is required but missing.";
    $voice_response = "Error: Temperature is required but missing.";
  }
  
  // ******************** Get duration ********************;
  $duration = $EchoJArray->request->intent->slots->duration->value;
  if(empty($duration)) {
    $duration = "1";
  }
  
  // ******************** Execute ********************;
  if($pass){
    $cmd = "/usr/bin/python /volume1/home_automation/therm.py";
    
    switch ($action) {
      
    case 'cancel':
      $output=shell_exec("$cmd -x");
      break;
      
    case 'status':
      $status = shell_exec("$cmd -s");
      break;

    case 'settings':
      $settings = shell_exec("$cmd -s");
      break;
      
    case 'cool':
      $output=shell_exec("$cmd -c $temp -t $duration");
      break;
      
    case 'heat':
      $output=shell_exec("$cmd -h $temp -t $duration");    
      break;
    }
  }
    
  // ******************** Responses ********************;
  if ($pass and $action=="cancel") {
    $text_title = "Canceling Thermostat Setting";
    $text_response = "Canceled previous setting. Returning to schedule.";
    $voice_response = "Canceled previous setting. Returning to schedule.";
    $voice_reprompt = "";
  } else if ($pass and $status) {
    $thermo_data = explode("\n",$status);
    // Array 0 is indoor temp
    preg_match("/.*\s*:\s*(\S+)\./", $thermo_data[0], $indoor_temp[1]);

    // Array 1 is indoor humidity
    preg_match("/.*\s*:\s*(\S+)\./", $thermo_data[1], $indoor_hum[1]);

    $text_title = "Thermostat settings";
    $text_response = "The indoor temperature is {$indoor_temp[1][1]}F with {$indoor_hum[1][1]}% humidity.";
    $voice_response = "The indoor temperature is {$indoor_temp[1][1]} degrees fahrenheit with {$indoor_hum[1][1]} percent humidity.";
    $voice_reprompt = "";
  } else if ($pass and $settings) {
    $thermo_data = explode("\n",$settings);
    // Array 2 is set cool
    preg_match("/.*\s*:\s*(\S+)./", $thermo_data[2], $set_cool[1]);
    
    // Array 3 is set heat
    preg_match("/.*\s*:\s*(\S+)./", $thermo_data[3], $set_heat[1]);
    
    $text_title = "Thermostat status";
    $text_response = "The temperature is set for {$set_cool[1][1]}F.";
    $voice_response = "The temperature is set for {$set_cool[1][1]} degrees fahrenheit.";
    $voice_reprompt = "";
  } else if($pass) {
    $text_title = "Setting Thermostat";
    $text_response = "Setting the temperature to $temp F for $duration hour(s).";
    $voice_response = "Setting the temperature to $temp degrees fahrenheit for $duration hour.";
    $voice_reprompt = "";
  }
  
  // ******************** JSON reply built below ********************;
  $RequestId = $EchoJArray->request->requestId;
  $ReturnValue = "";
  
  if( $RequestMessageType == "LaunchRequest" ){
    $ReturnValue= '
		{
		  "version": "1.0",
		  "sessionAttributes": {
			"countActionList": {
			  "read": true,
			  "category": true,
			  "currentTask": "none",
			  "currentStep": 0
			}
		  },
		  "response": {
			"outputSpeech": {
			  "type": "PlainText",
			  "text": "Done."
			}
		  },
                  "card": {
			  "type": "Simple",
			  "title": "' . $text_title . '",
			  "content": "' . $text_response . '"
			}
		}';
  }
  
  if( $RequestMessageType == "SessionEndedRequest" )
    {
      $ReturnValue = '{
		  "type": "SessionEndedRequest",
		  "requestId": "$RequestId",
		  "timestamp": "' . date("c") . '",
		  "reason": "USER_INITIATED "
		}
		';
      
    }
  
  if( $RequestMessageType == "IntentRequest" ){
    
    $ReturnValue= '
		{
		  "version": "1.0",
		  "sessionAttributes": {
			"countActionList": {
			  "read": true,
			  "category": true,
			  "currentTask": "none",
			  "currentStep": 0
			}
		  },
		  "response": {
			"outputSpeech": {
			  "type": "PlainText",
			  "text": "' . $voice_response . '"
			},
			"card": {
			  "type": "Simple",
			  "title": "' . $text_title . '",
			  "content": "' . $text_response . '"
			},
                        "reprompt": {
			  "outputSpeech": {
				"type": "PlainText",
				"text": "' . $voice_reprompt . '"
			  }
			},
                   "shouldEndSession": true
		  }
		
		}';
  }
  return $ReturnValue;
}

?>