通过路径下载文件

function getFile($url, $save_dir = '', $filename = '', $type = 0) {
if (trim($url) == '') {
return false;
}
if (trim($save_dir) == '') {
$save_dir = './';
}
if (0 !== strrpos($save_dir, '/')) {
$save_dir.= '/';
}
//创建保存目录
if (!file_exists($save_dir) && !mkdir($save_dir, 0777, true)) {
return false;
}
//获取远程文件所采用的方法
if ($type) {
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$content = curl_exec($ch);
curl_close($ch);
} else {
ob_start();
readfile($url);
$content = ob_get_contents();
ob_end_clean();
}
$size = strlen($content);
//文件大小
$fp2 = @fopen($save_dir . $filename, 'a');
fwrite($fp2, $content);
fclose($fp2);
unset($content, $url);
return true;

}

$url = '下载文件的路径url';

$save_dir ="保存的文件路径";

$filename="文件名.zip";

getFile（$url,$save_dir,$filename）