php & cURL start giving data to browser withut waiting to read all? -


hi i'm trying downlaod file in browser via proxy script on web server. code on webserver is:

<?php $file = 'http://example.com/somefile.mp3'; download($file,2000);  /* set headers total size of file loop through total size incrementing chunck size */ function download($file,$chunks){     set_time_limit(0);     header('content-description: file transfer');     header('content-type: application/octet-stream');     header('content-disposition: attachment; filename='.basename($file));     header('cache-control: must-revalidate, post-check=0, pre-check=0');     header('expires: 0');     header('pragma: public');     $size = get_size($file);     header('content-length: '.$size);      $i = 0;     while($i<=$size){         //output chunk         get_chunk($file,(($i==0)?$i:$i+1),((($i+$chunks)>$size)?$size:$i+$chunks));         $i = ($i+$chunks);     }  }  //callback function curlopt_writefunction, prints chunk function chunk($ch, $str) {     print($str);     return strlen($str); }  //function range of bytes remote file function get_chunk($file,$start,$end){     $ch = curl_init();     curl_setopt($ch, curlopt_url, $file);     curl_setopt($ch, curlopt_range, $start.'-'.$end);     curl_setopt($ch, curlopt_binarytransfer, 1);     curl_setopt($ch, curlopt_writefunction, 'chunk');     $result = curl_exec($ch);     curl_close($ch); }  //get total size of file function get_size($url){     $ch = curl_init();     curl_setopt($ch, curlopt_url, $url);     curl_setopt($ch, curlopt_followlocation, true);     curl_setopt($ch, curlopt_returntransfer, true);     curl_setopt($ch, curlopt_header, true);     curl_setopt($ch, curlopt_nobody, true);     curl_exec($ch);     $size = curl_getinfo($ch, curlinfo_content_length_download);     return intval($size); } ?>

when try download big file (more 500mb fo example) waits long time (someimtes throws 500 error of memory limit), , after few minutes browser asks save , starts downloading.

what should start downloading in browser immediatly curl gets first chunk of file??? posted question here asnswer didn't help. still loads memory first , gives browser.

dear community i'm stucked @ 2 days. please help!!!


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