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<?php

function multiple_download(array $urls, $save_path = '/tmp')
{
    $multi_handle = curl_multi_init();
    $file_pointers = [];
    $curl_handles = [];

    // Add curl multi handles, one per file we don't already have
    foreach ($urls as $key => $url) {
        $file = $save_path . '/' . basename($url);
        if(!is_file($file)) {
            $curl_handles[$key] = curl_init($url);
            $file_pointers[$key] = fopen($file, "w");
            curl_setopt($curl_handles[$key], CURLOPT_FILE, $file_pointers[$key]);
            curl_setopt($curl_handles[$key], CURLOPT_HEADER, 0);
            curl_setopt($curl_handles[$key], CURLOPT_CONNECTTIMEOUT, 60);
            curl_multi_add_handle($multi_handle,$curl_handles[$key]);
        }
    }

    // Download the files
    do {
        curl_multi_exec($multi_handle,$running);
    } while ($running > 0);

    // Free up objects
    foreach ($urls as $key => $url) {
        curl_multi_remove_handle($multi_handle, $curl_handles[$key]);
        curl_close($curl_handles[$key]);
        fclose ($file_pointers[$key]);
    }
    curl_multi_close($multi_handle);
}

// Files to download
$urls = [
    'http://static.scribd.com/docs/cdbwpohq0ayey.pdf',
    'http://static.scribd.com/docs/8wyxlxfufftas.pdf',
    'http://static.scribd.com/docs/9q29bbglnc2gk.pdf'
];


multiple_download($urls);