php服务器代理解决浏览器跨越问题

详见代码

<?php

$url = $_SERVER["QUERY_STRING"];

switch ($_SERVER['REQUEST_METHOD']) {
    case "GET":
        curlget($url);
        break;
    case "POST":
        $CONTENT_TYPE = explode(';',$_SERVER['CONTENT_TYPE']);
        switch($CONTENT_TYPE[0]) {
            case 'application/x-www-form-urlencoded':
                $data = http_build_query($_POST);
                break;
            case 'multipart/form-data':
                $tempname = $_FILES['file']['tmp_name'];
                $basename = basename($_FILES['file']['name']);
                $origname = sys_get_temp_dir() . '/' . $basename;
                move_uploaded_file($tempname, $origname);
                chdir(sys_get_temp_dir());
                $data = array('name' => 'file', 'filename' => '@' . $basename);
                break;
            default:
                exit;
        }
        curlpost($url, $data);
        break;
    default:
        exit;
}


function curlget($url) {
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_HEADER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  if (strpos($url,"https") >= 0) {
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  }
  $data = curl_exec($ch);
  if ($data === false) {
    header('HTTP/1.1 400 Bad Request');
    exit;
  } else {
  echo $data;
  }
}

function curlpost($url, $data) {
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_HEADER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
  if (strpos($url,"https") >= 0) {
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  }
  $data = curl_exec($ch);
  if ($data === false) {
    header('HTTP/1.1 400 Bad Request');
    exit;
  } else {
  echo $data;
  }
}
?>

如何使用：

1.把上面代码建立一个proxy.php的文件，放到PHP的后台服务器

2.在浏览器端用js访问，以jquery代码为例

$.ajax({
    url: "http://www.phphost.com/proxy.php?https://www.example.com/someApi",
    type: 'post',
    data: {
        a: "123",
        b: "456"
    },
    dataType: 'json',
    success: function(result){
        // do some things
    }
});

其中访问地址的格式是 PHP服务器地址+/proxy.php? + 需要跨域访问的接口；get、post 请求均可；

借鉴了https://www.cnblogs.com/zoho/archive/2012/07/03/2575380.html这里的代码，

增加了对https协议的支持。

由于本人PHP代码不精通，未做安全检测，自己测试够用。