php curl分割响应头和响应头

<?php
            $data = curl_exec($ch);
            $length = strpos($data,"\r\n\r\n");
            $length += 4;
            echo $length,"<br>";
            $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
            echo $headerSize,"<br>";
            $resHeader = substr($data,0,$headerSize);
            echo $resHeader,"<br>";
            $resBody = substr($data,$headerSize);
            echo $resBody,"<br>";
            die;

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