Aws\S3\S3Client::encodeKey PHP Method

    public static function encodeKey($key)
    {
        return str_replace('%2F', '/', rawurlencode($key));
    }

 /**
  * Changes how buckets are referenced in the HTTP request
  *
  * @param Event $event Event emitted
  */
 public function onCommandBeforeSend(Event $event)
 {
     $command = $event['command'];
     $bucket = $command['Bucket'];
     $request = $command->getRequest();
     $pathStyle = false;
     if ($key = $command['Key']) {
         // Modify the command Key to account for the {/Key*} explosion into an array
         if (is_array($key)) {
             $command['Key'] = $key = implode('/', $key);
         }
     }
     // Set the key and bucket on the request
     $request->getParams()->set('bucket', $bucket)->set('key', $key);
     // Switch to virtual if PathStyle is disabled, or not a DNS compatible bucket name, or the scheme is
     // http, or the scheme is https and there are no dots in the host header (avoids SSL issues)
     if (!$command['PathStyle'] && $command->getClient()->isValidBucketName($bucket) && !($command->getRequest()->getScheme() == 'https' && strpos($bucket, '.'))) {
         // Switch to virtual hosted bucket
         $request->setHost($bucket . '.' . $request->getHost());
         $request->setPath(preg_replace("#^/{$bucket}#", '', $request->getPath()));
     } else {
         $pathStyle = true;
     }
     if (!$bucket) {
         $request->getParams()->set('s3.resource', '/');
     } elseif ($pathStyle) {
         // Path style does not need a trailing slash
         $request->getParams()->set('s3.resource', '/' . rawurlencode($bucket) . ($key ? '/' . S3Client::encodeKey($key) : ''));
     } else {
         // Bucket style needs a trailing slash
         $request->getParams()->set('s3.resource', '/' . rawurlencode($bucket) . ($key ? '/' . S3Client::encodeKey($key) : '/'));
     }
 }