PHP integrates Qiniu to upload files

<?php 
/*
  *
  * @desc URL secure form base64 encoding
  * @param string $str
  * @return string
  */ 
 
 
function urlsafe_base64_encode($str){ 
  $find = array("+","/"); 
  $replace = array("-", "_"); 
  return str_replace($find, $replace, base64_encode($str)); 
} 
 
/**
  * generate_access_token
  *
  * @desc Signature operation
  * @param string $access_key
  * @param string $secret_key
  * @param string $url
  * @param array $params
  * @return string
  */ 
function generate_access_token($access_key, $secret_key, $url, $params = ''){ 
  $parsed_url = parse_url($url); 
  $path = $parsed_url['path']; 
  $access = $path; 
  if (isset($parsed_url['query'])) { 
    $access .= "?" . $parsed_url['query']; 
  } 
  $access .= "\n"; 
  if($params){ 
    if (is_array($params)){ 
      $params = http_build_query($params); 
    } 
    $access .= $params; 
  } 
  $digest = hash_hmac('sha1', $access, $secret_key, true); 
  return $access_key.':'.urlsafe_base64_encode($digest); 
} 
 
/**
  * test 
  */ 
 
$access_key = '''your access_key'; 
$secret_key = 'your secret_key'; 
 
$fetch = urlsafe_base64_encode('http://203.208.46.200/images/srpr/'); 
$to = urlsafe_base64_encode('ibeircn:'); 
 
$url = '/fetch/'. $fetch .'/to/' . $to; 
 
$access_token = generate_access_token($access_key, $secret_key, $url); 
 
$header[] = 'Content-Type: application/json'; 
$header[] = 'Authorization: QBox '. $access_token; 
 
 
$con = send('/fetch/'.$fetch.'/to/'.$to, $header); 
var_dump($con); 
 
function send($url, $header = '') { 
  $curl = curl_init($url); 
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
  curl_setopt($curl, CURLOPT_HEADER,1); 
  curl_setopt($curl, CURLOPT_HTTPHEADER, $header); 
  curl_setopt($curl, CURLOPT_POST, 1); 
 
  $con = curl_exec($curl); 
 
  if ($con === false) { 
    echo 'CURL ERROR: ' . curl_error($curl); 
  } else { 
    return $con; 
  } 
} 
?>