Simple web service endpoint for NIH Toolbox in PHP

nih_toolbox.php

<?php

$target_dir = "uploads/";
error_reporting(-1);
ini_set('display_errors', 'On');
date_default_timezone_set('America/Chicago');

if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
  header('Content-Length: 0');
  header('Connection: keep-alive');
  header('Access-Control-Allow-Origin: *');
  header('Access-Control-Allow-Headers: Authorization, Origin, content-type, accept');
  header('Access-Control-Allow-Credentials: true');
  header('Access-Control-Allow-Methods: OPTIONS, GET, POST');
  return;
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  // PHP's $_FILES array is weird. This is handy to debug it.
  //dump = var_export($_FILES, true);
  //file_put_contents("output.log", $dump);
  try {
    $f = reset($_FILES);
    $target_file = $target_dir . basename($f['name']);
    move_uploaded_file($f["tmp_name"], $target_file);
    
    header('Content-Type: application/json');
    echo '{"error":"0"}';
    http_response_code(200);
    
  } catch (exception $e) {
    header('Content-Type: application/json');
    echo '{"error":' . $e->getMessage() . "\n" . $e->getTraceAsString() . '}';
    http_response_code(500);
  } 
    
} else {
  http_response_code(405);
} 
  
?>