php使用CURL带header头

php使用CURL带header头：

$aHeader = array('Content-type: application/json');
$real_name_curl_res = $this->http_post($sUrl, $aHeader, $aData);

function http_post($sUrl, $aHeader, $aData){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_URL, $sUrl);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $aData);
        $sResult = curl_exec($ch);
        if($sError=curl_error($ch)){
            die($sError);
        }
        curl_close($ch);
        return $sResult;
    }