PHP fsockopen函数说明：
Open Internet or Unix domain socket connection（打开套接字链接）Initiates a socket connection to the resource specified by target .
fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets() , fgetss() , fwrite() , fclose() , and feof() ).就是返回一个文件句柄
开启PHP fsockopen这个函数
PHP fsockopen需要 PHP.ini 中 allow_url_fopen 选项开启
例子如下：
[*] $fp = fsockopen("www.example.com",
80, $errno, $errstr, 30);
[*] if (!$fp) {
[*] echo "$errstr ($errno)\n";
[*] } else {
[*] $out = "GET / HTTP/1.1\r\n";
[*] $out .= "Host: www.example.com\r\n";
[*] $out .= "Connection: Close\r\n\r\n";
[*] fwrite($fp, $out);
[*] while (!feof($fp)) {
[*] echo fgets($fp, 128);
[*] }
[*] fclose($fp);
[*] }
处理下载问题时，所用到的方法
function downloadFile($file) {
$host = '********';
$out = "GET $file HTTP/1.0\r\n";
$out .= "Host: $host\r\n";
$out .= "Connection: Close\r\n\r\n";
$fp = fsockopen($host, 80);
fwrite($fp, $out);
$headers = array();
$body = '';
$filenameExt = '';
$isBody = false;
while(true) {
$line = fgets($fp);
if (false === $line) {
break;
}
if ($line == "\r\n") {
$isBody = true;
continue;
}
if ($isBody) {
$body .= $line;
echo strlen($body) . " ... \r";
} else {
if (strpos($line, 'filename')) {
preg_match('!filename="(.+?)\.([\w]+)"!', $line, $filename);
$filenameExt = $filename;
}
$headers[] = trim($line);
}
}
fclose($fp);
return array('fileExt' => $filenameExt, 'headers' => $headers, 'body' => $body);
}
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