基於 PHP Reverse Proxy (PRP) 修改優化，修復原版錯誤，新增文件上傳支持、文件類型識別、指定後端 IP、SAE 環境適配等功能。適用於 API 網關、跨域代理、內網穿透等場景。
<?php $proxy = new PhpReverseProxy(); $proxy->port = "8080"; $proxy->host = "www.example.com"; // $proxy->ip = "1.1.1.1"; // 可選：指定後端 IP $proxy->forward_path = ""; $proxy->connect(); $proxy->output();
<?php
// Source Code: https://www.xiumu.org/technology/php-reverse-proxy-class.shtml
class PhpReverseProxy {
public $publicBaseURL;
public $outsideHeaders;
public $XRequestedWith;
public $sendPost;
public $port, $host, $ip, $content, $forward_path, $content_type, $user_agent,
$XFF, $request_method, $IMS, $cacheTime, $cookie, $authorization;
private $http_code, $lastModified, $version, $resultHeader;
const chunkSize = 10000;
function __construct() {
$this->version = "PHP Reverse Proxy (PRP) 1.0";
$this->port = "8080";
$this->host = "127.0.0.1";
$this->ip = "";
$this->content = "";
$this->forward_path = "";
$this->path = "";
$this->content_type = "";
$this->user_agent = "";
$this->http_code = "";
$this->XFF = "";
$this->request_method = "GET";
$this->IMS = false;
$this->cacheTime = 72000;
$this->lastModified = gmdate("D, d M Y H:i:s", time()-72000) . " GMT";
$this->cookie = "";
$this->XRequestedWith = "";
$this->authorization = "";
}
function translateURL($serverName) {
$this->path = $this->forward_path . $_SERVER['REQUEST_URI'];
if (defined('IS_SAE') && IS_SAE) return $this->translateServer($serverName) . $this->path;
if ($_SERVER['QUERY_STRING'] == "") return $this->translateServer($serverName) . $this->path;
else return $this->translateServer($serverName) . $this->path . "?" . $_SERVER['QUERY_STRING'];
}
function translateServer($serverName) {
$s = empty($_SERVER["HTTPS"]) ? '' : ($_SERVER["HTTPS"] == "on") ? "s" : "";
$protocol = $this->left(strtolower($_SERVER["SERVER_PROTOCOL"]), "/") . $s;
if ($this->port == "") return $protocol . "://" . $serverName;
else return $protocol . "://" . $serverName . ":" . $this->port;
}
function left($s1, $s2) {
return substr($s1, 0, strpos($s1, $s2));
}
function preConnect() {
$this->user_agent = $_SERVER['HTTP_USER_AGENT'];
$this->request_method = $_SERVER['REQUEST_METHOD'];
$tempCookie = "";
foreach ($_COOKIE as $i => $value) {
$tempCookie .= " $i=$_COOKIE[$i];";
}
$this->cookie = $tempCookie;
if (empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$this->XFF = $_SERVER['REMOTE_ADDR'];
} else {
$this->XFF = $_SERVER['HTTP_X_FORWARDED_FOR'] . ", " . $_SERVER['REMOTE_ADDR'];
}
}
function connect() {
if (empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$this->preConnect();
$ch = curl_init();
if ($this->request_method == "POST") {
curl_setopt($ch, CURLOPT_POST, 1);
$postData = array();
$filePost = false;
$uploadPath = 'uploads/';
if (defined('IS_SAE') && IS_SAE) $uploadPath = SAE_TMP_PATH;
if (count($_FILES) > 0) {
if (!is_writable($uploadPath)) {
die('You cannot upload to the specified directory, please CHMOD it to 777.');
}
foreach ($_FILES as $key => $fileArray) {
copy($fileArray["tmp_name"], $uploadPath . $fileArray["name"]);
$proxyLocation = "@" . $uploadPath . $fileArray["name"] . ";type=" . $fileArray["type"];
$postData = array($key => $proxyLocation);
$filePost = true;
}
}
foreach ($_POST as $key => $value) {
if (!is_array($value)) {
$postData[$key] = $value;
} else {
$postData[$key] = serialize($value);
}
}
if (!$filePost) {
$postString = "";
$firstLoop = true;
foreach ($postData as $key => $value) {
$parameterItem = urlencode($key) . "=" . urlencode($value);
if ($firstLoop) {
$postString .= $parameterItem;
} else {
$postString .= "&" . $parameterItem;
}
$firstLoop = false;
}
$postData = $postString;
}
$this->sendPost = $postData;
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
}
// 處理 URL 多重 ? 問題
$translateURL = $this->translateURL(($this->ip) ? $this->ip : $this->host);
if (substr_count($translateURL, "?") > 1) {
$firstPos = strpos($translateURL, "?", 0);
$secondPos = strpos($translateURL, "?", $firstPos + 1);
$translateURL = substr($translateURL, 0, $secondPos);
}
curl_setopt($ch, CURLOPT_URL, $translateURL);
$proxyHeaders = array(
"X-Forwarded-For: " . $this->XFF,
"User-Agent: " . $this->user_agent,
"Host: " . $this->host
);
if (strlen($this->XRequestedWith) > 1) {
$proxyHeaders[] = "X-Requested-With: " . $this->XRequestedWith;
}
curl_setopt($ch, CURLOPT_HTTPHEADER, $proxyHeaders);
if ($this->cookie != "") {
curl_setopt($ch, CURLOPT_COOKIE, $this->cookie);
}
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);
$this->postConnect($info, $output);
} else {
$this->lastModified = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
$this->IMS = true;
}
}
function postConnect($info, $output) {
$this->content_type = $info["content_type"];
$this->http_code = $info['http_code'];
if (!empty($info['last_modified'])) {
$this->lastModified = $info['last_modified'];
}
$this->resultHeader = substr($output, 0, $info['header_size']);
$content = substr($output, $info['header_size']);
if ($this->http_code == '200') {
$this->content = $content;
} elseif (($this->http_code == '302' || $this->http_code == '301') && isset($info['redirect_url'])) {
$redirect_url = str_replace($this->host, $_SERVER['HTTP_HOST'], $info['redirect_url']);
if (defined('IS_SAE') && IS_SAE) $redirect_url = str_replace('https://fetchurl.sae.sina.com.cn/', '', $info['redirect_url']);
header("Location: $redirect_url");
exit;
} elseif ($this->http_code == '404') {
header("HTTP/1.1 404 Not Found");
exit("HTTP/1.1 404 Not Found");
} elseif ($this->http_code == '500') {
header('HTTP/1.1 500 Internal Server Error');
exit("HTTP/1.1 500 Internal Server Error");
} else {
exit("HTTP/1.1 " . $this->http_code . " Internal Server Error");
}
}
function output() {
$currentTimeString = gmdate("D, d M Y H:i:s", time());
$expiredTime = gmdate("D, d M Y H:i:s", (time() + $this->cacheTime));
$doOriginalHeaders = true;
if ($doOriginalHeaders) {
if ($this->IMS) {
header("HTTP/1.1 304 Not Modified");
header("Date: Wed, $currentTimeString GMT");
header("Last-Modified: $this->lastModified");
header("Server: $this->version");
} else {
header("HTTP/1.1 200 OK");
header("Date: Wed, $currentTimeString GMT");
header("Content-Type: " . $this->content_type);
header("Last-Modified: $this->lastModified");
header("Cache-Control: max-age=$this->cacheTime");
header("Expires: $expiredTime GMT");
header("Server: $this->version");
preg_match("/Set-Cookie:[^\n]*/i", $this->resultHeader, $result);
foreach ($result as $i => $value) {
header($result[$i]);
}
preg_match("/Content-Encoding:[^\n]*/i", $this->resultHeader, $result);
foreach ($result as $i => $value) {
// header($result[$i]);
}
preg_match("/Transfer-Encoding:[^\n]*/i", $this->resultHeader, $result);
foreach ($result as $i => $value) {
// header($result[$i]);
}
echo($this->content);
}
} else {
$headerString = $this->resultHeader;
$headerArray = explode("\n", $headerString);
foreach ($headerArray as $privHeader) {
header($privHeader);
}
if (stristr($headerString, "Transfer-encoding: chunked")) {
flush();
ob_flush();
$i = 0;
$maxLen = strlen($this->content);
while ($i < $maxLen) {
$endChar = $i + self::chunkSize;
if ($endChar >= $maxLen) {
$endChar = $maxLen - 1;
}
$chunk = substr($this->content, $i, $endChar);
$this->dump_chunk($chunk);
flush();
ob_flush();
$i = $i + $endChar;
}
} else {
echo($this->content);
}
}
}
function dump_chunk($chunk) {
echo sprintf("%x\r\n", strlen($chunk));
echo $chunk;
echo "\r\n";
}
function getOutsideHeaders() {
$headers = array();
foreach ($_SERVER as $name => $value) {
if (substr($name, 0, 5) == 'HTTP_') {
$name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
$headers[$name] = $value;
} elseif ($name == "CONTENT_TYPE") {
$headers["Content-Type"] = $value;
} elseif ($name == "CONTENT_LENGTH") {
$headers["Content-Length"] = $value;
} elseif (stristr($name, "X-Requested-With")) {
$headers["X-Requested-With"] = $value;
$this->XRequestedWith = $value;
}
}
$this->outsideHeaders = $headers;
return $headers;
}
}
?>
Q: 如何用 PHP 實現域名重定向代理？
A: 可在入口文件中根據 $_SERVER['HTTP_HOST'] 判斷域名，實例化代理類指向不同後端；或使用 Apache/Nginx 的虛擬主機配置、.htaccess 重寫規則。
Q: PHP 調用另一個類的靜態方法報錯怎麼辦？
A: 確保先 include/require 載入目標類文件；檢查方法訪問修飾符（public/private）；靜態方法調用需用 ClassName::methodName()，不能用 $obj->method()。
