可以在这里演示复制大文件的最简单方法从 php stdin 保存大文件,但没有显示如何复制具有 http 范围的文件
$url = "http://REMOTE_FILE";
$local = __DIR__ . "/test.dat";
try {
$download = new Downloader($url);
$download->start($local); // Start Download Process
} catch (Exception $e) {
printf("Copied %d bytes\n", $pos = $download->getPos());
}
发生异常时,您可以恢复最后一点的文件下载
$download->setPos($pos);
使用的类
class Downloader {
private $url;
private $length = 8192;
private $pos = 0;
private $timeout = 60;
public function __construct($url) {
$this->url = $url;
}
public function setLength($length) {
$this->length = $length;
}
public function setTimeout($timeout) {
$this->timeout = $timeout;
}
public function setPos($pos) {
$this->pos = $pos;
}
public function getPos() {
return $this->pos;
}
public function start($local) {
$part = $this->getPart("0-1");
// Check partial Support
if ($part && strlen($part) === 2) {
// Split data with curl
$this->runPartial($local);
} else {
// Use stream copy
$this->runNormal($local);
}
}
private function runNormal($local) {
$in = fopen($this->url, "r");
$out = fopen($local, 'w');
$pos = ftell($in);
while(($pos = ftell($in)) <= $this->pos) {
$n = ($pos + $this->length) > $this->length ? $this->length : $this->pos;
fread($in, $n);
}
$this->pos = stream_copy_to_stream($in, $out);
return $this->pos;
}
private function runPartial($local) {
$i = $this->pos;
$fp = fopen($local, 'w');
fseek($fp, $this->pos);
while(true) {
$data = $this->getPart(sprintf("%d-%d", $i, ($i + $this->length)));
$i += strlen($data);
fwrite($fp, $data);
$this->pos = $i;
if ($data === - 1)
throw new Exception("File Corupted");
if (! $data)
break;
}
fclose($fp);
}
private function getPart($range) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->url);
curl_setopt($ch, CURLOPT_RANGE, $range);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeout);
$result = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Request not Satisfiable
if ($code == 416)
return false;
// Check 206 Partial Content
if ($code != 206)
return - 1;
return $result;
}
}