A simple script to receive a JSON object with "on and "off" directives and call a python script to turn a heater on or off.

heater.php

<?php

$EchoJArray = json_decode(file_get_contents('php://input'));
$RequestType = $EchoJArray->request; // I don't use this yet

  // ******************** Get state ********************;
$action = $EchoJArray->power;
if(empty($action)) {
    $action = "off";
}

  // ******************** Execute ********************;

$cmd = "/home/pi/alexa/heater.py";
    
switch ($action) {
     case 'on':
         $output=shell_exec("$cmd -n");
     break;
      
     case 'off':
         $output = shell_exec("$cmd -f");
     break;
}

?>