Description:
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The doc says:

http://php.net/manual/en/function.curl-getinfo.php

"If opt is given, returns its value as a string. Otherwise, returns an associative array with the following elements (which correspond to opt), or FALSE on failure"

Test script:
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<?php

$resCurl = curl_init('http://www.dddbl.de');
curl_exec($resCurl);
var_dump(curl_getinfo($resCurl, CURLINFO_CONTENT_LENGTH_DOWNLOAD));


Expected result:
----------------
string(4) "4531"

Actual result:
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float(4531)