Download script by Curl method

Question

I’m having some problems with the process of script down below.

Literally it is making the download very slow, and this when the download process does not occur to fall or restart from scratch.

Is there any way to fix this, so that the download is done normally, with a more effective process?

The downloadable files reach at most 350MB.

Updating: Someone would know to tell me what the problem is I’ve already changed in php.ini the parameter settings for memory_limit, post_max_size, upload_max_filesize and max_execution_time and even then the download process remains slow.

<?php
$file = 'http://thumb.mais.uol.com.br/15540367.mp4';
download($file,314572800);


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){

    get_chunk($file,(($i==0)?$i:$i+1),((($i+$chunks)>$size)?$size:$i+$chunks));
        $i = ($i+$chunks);
    }

}

function chunk($ch, $str) {
    print($str);
    return strlen($str);
}

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);
}

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);
}
?>

Answer 1

    //Tempo de execução ilimitado, visto que você
    //baixará arquivos grandes
    set_time_limit(0);     
    /*Ponteiro do Curl*/
    $ch = curl_init();

    /*Ponteiro do arquivo que será salvo*/
    $fp = fopen($destino, "w");

    /*Configuração*/
    $options = [
                 CURLOPT_RETURNTRANSFER => true, //preciso da resposta armazenada
                 CURLOPT_TIMEOUT => 120,         // limite de 120 segundos
                 CURLOPT_URL => $url,            //recurso a ser procurado
                 CURLOPT_FILE => $fp,            //ponteiro do arquivo
                 CURLOPT_HEADER => false,        //Para não corromper o arquivo
               ];

    /*Aplica a configuração*/
    curl_setopt_array($ch, $options);

    /*Baixa o arquivo*/
    curl_exec($ch);

    /*Fecha o ponteiro do arquivo*/
    fclose($fp);

    /*Fecha o Curl*/
    curl_close($ch);