download something from Internet

downloadFile.php

<?php
function downloadFile($url, $saveName){
    set_time_limit(0);

    // create a new cURL resource
    $ch = curl_init();

    // set URL and other appropriate options
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
    curl_setopt($ch, CURLOPT_AUTOREFERER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    // grab URL and pass it to the browser
    $opt = curl_exec($ch);

    // close cURL resource, and free up system resources
    curl_close($ch);

    $handle = fopen($saveName, 'wb');
    fwrite($handle, $opt);
    fclose($handle);
}

?>