ArcGIS quakes example unexpected token < error

I have been playing with one of the example ArcGIS samples from the 'Building Web Applications Using the ArcGIS API for JavaScript' and kept getting an annoying error:

esri.request failed: SyntaxError: Unexpected token < quakes.js:164

1. 
   
2.  

Which stops the quakes layer loading.

The esri.request method requires a web server running hosting the example and a proxy page to call the quakes XML service:


function requestQuakes(){
esri.config.defaults.io.proxyUrl = "proxy.php"; //relative - if proxy.php is in the same application as the web page

var requestHandle = esri.request({
 url: "http://earthquake.usgs.gov/earthquakes/feed/geojson/1.0/week",
 load: requestSucceeded,
 error: requestFailed
}, {
 useProxy: true // changed from True
});
}

I'm using a php proxy that I downloaded from ArcGIS.  

When I run it under the EasyPHP server that error came up. 

I chased the error down to the proxy.php script echoing out error messages due to uninitialized variables and missing keys from arrays.  Once I had eliminated those errors the page loaded correctly.  It seems the error messages were getting returned with the usgs earthquakes JSON and messing up the dojo JSON parser.

The new proxy.php




<?php
  /***************************************************************************
   * USAGE
   * [1] http://<this-proxy-url>?<arcgis-service-url>
   * [2] http://<this-proxy-url>?<arcgis-service-url> (with POST body)
   * [3] http://<this-proxy-url>?<arcgis-service-url>?token=ABCDEFGH
   * 
   * note: [3] is used when fetching tiles from a secured service and the 
   * JavaScript app sends the token instead of being set in this proxy
   * 
   * REQUIREMENTS
   *  - cURL extension for PHP must be installed and loaded. To load it, 
   *    add the following lines to your php.ini file:
   *     extension_dir = "<your-php-install-location>/ext"
   *     extension = php_curl.dll
   *     
   *  - Turn OFF magic quotes for incoming GET/POST data: add/modify the
   *    following line to your php.ini file:
   *     magic_quotes_gpc = Off 
   * 
   ***************************************************************************/

  /***************************************************************************
   * <true> to only proxy to the sites listed in '$serverUrls'
   * <false> to proxy to any site (are you sure you want to do this?)
   */
  $mustMatch = false;
  
  /***************************************************************************
   * ArcGIS Server services this proxy will forward requests to
   * 
   * 'url'      = location of the ArcGIS Server, either specific URL or stem
   * 'matchAll' = <true> to forward any request beginning with the URL
   *              <false> to forward only the request that exactly matches the url
   * 'token'    = token to include for secured service, if any, otherwise leave it
   *              empty
   */
  $serverUrls = array(
    array( 'url' => 'http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/', 'matchAll' => true, 'token' => '' ),
    array( 'url' => 'http://sampleserver2.arcgisonline.com/ArcGIS/rest/services/', 'matchAll' => true, 'token' => '' ),
    array( 'url' => 'http://sampleserver1a.arcgisonline.com/arcgisoutput/',        'matchAll' => true, 'token' => '' ),
    array( 'url' => 'http://sampleserver1b.arcgisonline.com/arcgisoutput/',        'matchAll' => true, 'token' => '' ),
    array( 'url' => 'http://sampleserver1c.arcgisonline.com/arcgisoutput/',        'matchAll' => true, 'token' => '' )
  );
  /***************************************************************************/
  
  function is_url_allowed($allowedServers, $url) {
    $isOk = false;
    $url = trim($url, "\/");
    for ($i = 0, $len = count($allowedServers); $i < $len; $i++) {
      $value = $allowedServers[$i];
      $allowedUrl = trim($value['url'], "\/");
      if ($value['matchAll']) {
        if (stripos($url, $allowedUrl) === 0) {
          $isOk = $i; // array index that matched
          break;
        }
      }
      else {
        if ((strcasecmp($url, $allowedUrl) == 0)) {
          $isOk = $i; // array index that matched
          break;
        }
      }
    }
    return $isOk;
  }
  
  // check if the curl extension is loaded
  if (!extension_loaded("curl")) {
    header('Status: 500', true, 500);
    echo 'cURL extension for PHP is not loaded! <br/> Add the following lines to your php.ini file: <br/> extension_dir = &quot;&lt;your-php-install-location&gt;/ext&quot; <br/> extension = php_curl.dll';
    return;
  }
  
  $targetUrl = $_SERVER['QUERY_STRING'];
  if (!$targetUrl) {
    header('Status: 400', true, 400); // Bad Request
    echo 'Target URL is not specified! <br/> Usage: <br/> http://&lt;this-proxy-url&gt;?&lt;target-url&gt;';
    return;
  }
  
  $parts = preg_split("/\?/", $targetUrl);
  $targetPath = $parts[0];
  
  // check if the request URL matches any of the allowed URLs

  if ($mustMatch) {
$pos = is_url_allowed($serverUrls, $targetPath);
if ($pos === false) {
header('Status: 403', true, 403); // Forbidden
echo 'Target URL is not allowed! <br/> Consult the documentation for this proxy to add the target URL to its Whitelist.';
return;
}
 
// add token (if any) to the url
$token = $serverUrls[$pos]['token'];
if ($token) {
$targetUrl .= (stripos($targetUrl, "?") !== false ? '&' : '?').'token='.$token;
}
  }
  // open the curl session
  $session = curl_init();
  /*foreach ($_SERVER as $key => $value) {
print "$key: $value<br>\n";
}*/
  // set the appropriate options for this request
  // increase timeout from 60 seconds
  $options = array(
    CURLOPT_URL => $targetUrl,
    CURLOPT_HEADER => false,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_FOLLOWLOCATION => true,
CURLOPT_TIMEOUT => 240
  );

  if ( array_key_exists('CONTENT_TYPE', $_SERVER) and array_key_exists('HTTP_REFERER', $_SERVER) ){
    $options[CURLOPT_HTTPHEADER] = array(
      'Content-Type: ' . $_SERVER['CONTENT_TYPE'],
      'Referer: ' . $_SERVER['HTTP_REFERER']
    );
  }
  
  // put the POST data in the request body
  $postData = file_get_contents("php://input");
  if (strlen($postData) > 0) {
    $options[CURLOPT_POST] = true;
    $options[CURLOPT_POSTFIELDS] = $postData;
  }
  curl_setopt_array($session, $options);
  
  // make the call
  $response = curl_exec($session);
  $code = curl_getinfo($session, CURLINFO_HTTP_CODE);
  $type = curl_getinfo($session, CURLINFO_CONTENT_TYPE);
  curl_close($session);
  
  // set the proper Content-Type
  header("Status: ".$code, true, $code);
  header("Content-Type: ".$type);
  
  echo $response;
?>