PHP CURLOPT_CERTINFO

sample php code using CURLOPT_CERTINFO, the php equivalent of CURLINFO_CERTINFO which is only available in php >=5.3.2 .

<?php
if($fp = tmpfile())
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,"https://www.digicert.com/");
    curl_setopt($ch, CURLOPT_STDERR, $fp);
    curl_setopt($ch, CURLOPT_CERTINFO, 1);//certinfo goes to STDERR when CURLOPT_VERBOSE is set
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,  2);
    curl_setopt($ch, CURLOPT_SSLVERSION,3);
    $result = curl_exec($ch);
    curl_errno($ch)==0 or die("Error:" . curl_errno($ch) . " Message:" . curl_error($ch));
    fseek($fp, 0);//rewind
    $str='';
    while(strlen($str.=fread($fp,8192))==8192);
    echo $str;
    fclose($fp);
}
?>