urlencode except slash

Author: rwifeng

src/Qiniu/Cdn/CdnManager.php

@@ -175,6 +175,7 @@ public static function createTimestampAntiLeechUrl($rawUrl, $encryptKey, $durati
         $deadline = time() + $durationInSeconds;
         $expireHex = dechex($deadline);
         $path = isset($parsedUrl['path']) ? $parsedUrl['path'] : '';
+        $path = implode('/', array_map('rawurlencode', explode('/', $path)));
 
         $strToSign = $encryptKey . $path . $expireHex;
         $signStr = md5($strToSign);