实例：http://www.ikeepstudying.com/tools/proxy/

index.php

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" language="javascript">
// I want to use json2.js because it allows me to format stringified JSON with
// pretty indents, so let's nuke any existing browser-specific JSON parser.
window.JSON = null;
</script>
<script type="text/javascript" src="/js/jquery-1.8.2.min.js"></script>
<script type="text/javascript" src="http://benalman.com/code/projects/php-simple-proxy/shared/json2.js"></script>
<script>(function($){$(document).ready(function(e){// Handle form submit.$('#params').submit(function(){var proxy = 'proxy.php', url = proxy + '?' + $('#params').serialize();// Update some stuff.$('#request').html( $('<a/>').attr( 'href', url ).text( url ) );$('#response').html( 'Loading...' );// Test to see if HTML mode.if ( /mode=native/.test( url ) ) {// Make GET request.$.get( url, function(data){$('#response').html( '<pre class="brush:xml"/>' ).find( 'pre' ).text( data );});} else {// Make JSON request.$.getJSON( url, function(data){$('#response').html( '<pre class="brush:js"/>' ).find( 'pre' ).text( JSON.stringify( data, null, 2 ) );});}// Prevent default form submit action.return false;});// Submit the form on page load if ?url= is passed into the example page.if ( $('#url').val() !== '' ) $('#params').submit();// Disable AJAX caching.$.ajaxSetup({ cache: false });// Disable dependent checkboxes as necessary.$('input:radio').click(function(){var that = $(this),c1 = 'dependent-' + that.attr('name'),c2 = c1 + '-' + that.val();that.closest('form').find( '.' + c1 + ' input' ).attr( 'disabled', 'disabled' ).end().find( '.' + c2 + ' input' ).removeAttr( 'disabled' );});// Clicking sample remote urls should populate the "Remote URL" box.$('#sample a').click(function(){$('#url').val( $(this).attr( 'href' ) );return false;});});})($staff)
</script> <form action="" method="get" id="params"><div><label><b>Remote URL</b><input type="text" value="" name="url" class="text" id="url" style="width:90%" /></label></div><p id="sample">..or try these sample Remote URLs:<a href="http://github.com/">GitHub</a>,<a href="http://github.com/cowboy/php-simple-proxy/raw/master/examples/simple/json_sample.js">a sample JSON (not JSONP) request</a>,<a href="http://github.com/omg404errorpage">a 404 error page</a></p><div><label><input type="radio" disabled="disabled" value="native" name="mode">Native <i>(disabled by default)</i></label></div><div><label><input type="radio" disabled="disabled" checked="checked" value="json" name="mode">JSON</label></div><div class="dependent-mode dependent-mode-json indent"><div><label><input type="checkbox" checked="checked" value="1" name="full_headers">Full Headers</label></div><div><label><input type="checkbox" checked="checked" value="1" name="full_status">Full Status</label></div></div><input type="submit" value="Submit" name="submit" class="submit">
</form><h3>Request URL</h3>
<p id="request">N/A, click Submit!</p>
<h3>Simple PHP Proxy response</h3>
<div id="response">N/A, click Submit!</div>

proxy.php

<?PHP// Script: Simple PHP Proxy: Get external HTML, JSON and more!
//
// *Version: 1.6, Last updated: 1/24/2009*
//
// Project Home - http://benalman.com/projects/php-simple-proxy/
// GitHub       - http://github.com/cowboy/php-simple-proxy/
// Source       - http://github.com/cowboy/php-simple-proxy/raw/master/ba-simple-proxy.php
//
// About: License
//
// Copyright (c) 2010 "Cowboy" Ben Alman,
// Dual licensed under the MIT and GPL licenses.
// http://benalman.com/about/license/
//
// About: Examples
//
// This working example, complete with fully commented code, illustrates one way
// in which this PHP script can be used.
//
// Simple - http://benalman.com/code/projects/php-simple-proxy/examples/simple/
//
// About: Release History
//
// 1.6 - (1/24/2009) Now defaults to JSON mode, which can now be changed to
//       native mode by specifying ?mode=native. Native and JSONP modes are
//       disabled by default because of possible XSS vulnerability issues, but
//       are configurable in the PHP script along with a url validation regex.
// 1.5 - (12/27/2009) Initial release
//
// Topic: GET Parameters
//
// Certain GET (query string) parameters may be passed into ba-simple-proxy.php
// to control its behavior, this is a list of these parameters.
//
//   url - The remote URL resource to fetch. Any GET parameters to be passed
//     through to the remote URL resource must be urlencoded in this parameter.
//   mode - If mode=native, the response will be sent using the same content
//     type and headers that the remote URL resource returned. If omitted, the
//     response will be JSON (or JSONP). <Native requests> and <JSONP requests>
//     are disabled by default, see <Configuration Options> for more information.
//   callback - If specified, the response JSON will be wrapped in this named
//     function call. This parameter and <JSONP requests> are disabled by
//     default, see <Configuration Options> for more information.
//   user_agent - This value will be sent to the remote URL request as the
//     `User-Agent:` HTTP request header. If omitted, the browser user agent
//     will be passed through.
//   send_cookies - If send_cookies=1, all cookies will be forwarded through to
//     the remote URL request.
//   send_session - If send_session=1 and send_cookies=1, the SID cookie will be
//     forwarded through to the remote URL request.
//   full_headers - If a JSON request and full_headers=1, the JSON response will
//     contain detailed header information.
//   full_status - If a JSON request and full_status=1, the JSON response will
//     contain detailed cURL status information, otherwise it will just contain
//     the `http_code` property.
//
// Topic: POST Parameters
//
// All POST parameters are automatically passed through to the remote URL
// request.
//
// Topic: JSON requests
//
// This request will return the contents of the specified url in JSON format.
//
// Request:
//
// > ba-simple-proxy.php?url=http://example.com/
//
// Response:
//
// > { "contents": "<html>...</html>", "headers": {...}, "status": {...} }
//
// JSON object properties:
//
//   contents - (String) The contents of the remote URL resource.
//   headers - (Object) A hash of HTTP headers returned by the remote URL
//     resource.
//   status - (Object) A hash of status codes returned by cURL.
//
// Topic: JSONP requests
//
// This request will return the contents of the specified url in JSONP format
// (but only if $enable_jsonp is enabled in the PHP script).
//
// Request:
//
// > ba-simple-proxy.php?url=http://example.com/&callback=foo
//
// Response:
//
// > foo({ "contents": "<html>...</html>", "headers": {...}, "status": {...} })
//
// JSON object properties:
//
//   contents - (String) The contents of the remote URL resource.
//   headers - (Object) A hash of HTTP headers returned by the remote URL
//     resource.
//   status - (Object) A hash of status codes returned by cURL.
//
// Topic: Native requests
//
// This request will return the contents of the specified url in the format it
// was received in, including the same content-type and other headers (but only
// if $enable_native is enabled in the PHP script).
//
// Request:
//
// > ba-simple-proxy.php?url=http://example.com/&mode=native
//
// Response:
//
// > <html>...</html>
//
// Topic: Notes
//
// * Assumes magic_quotes_gpc = Off in php.ini
//
// Topic: Configuration Options
//
// These variables can be manually edited in the PHP file if necessary.
//
//   $enable_jsonp - Only enable <JSONP requests> if you really need to. If you
//     install this script on the same server as the page you're calling it
//     from, plain JSON will work. Defaults to false.
//   $enable_native - You can enable <Native requests>, but you should only do
//     this if you also whitelist specific URLs using $valid_url_regex, to avoid
//     possible XSS vulnerabilities. Defaults to false.
//   $valid_url_regex - This regex is matched against the url parameter to
//     ensure that it is valid. This setting only needs to be used if either
//     $enable_jsonp or $enable_native are enabled. Defaults to '/.*/' which
//     validates all URLs.
//
// ############################################################################// Change these configuration options if needed, see above descriptions for info.
$enable_jsonp    = false;
$enable_native   = false;
$valid_url_regex = '/.*/';// ############################################################################$url = $_GET['url'];if ( !$url ) {// Passed url not specified.$contents = 'ERROR: url not specified';$status = array( 'http_code' => 'ERROR' );} else if ( !preg_match( $valid_url_regex, $url ) ) {// Passed url doesn't match $valid_url_regex.$contents = 'ERROR: invalid url';$status = array( 'http_code' => 'ERROR' );} else {$ch = curl_init( $url );if ( strtolower($_SERVER['REQUEST_METHOD']) == 'post' ) {curl_setopt( $ch, CURLOPT_POST, true );curl_setopt( $ch, CURLOPT_POSTFIELDS, $_POST );}if ( $_GET['send_cookies'] ) {$cookie = array();foreach ( $_COOKIE as $key => $value ) {$cookie[] = $key . '=' . $value;}if ( $_GET['send_session'] ) {$cookie[] = SID;}$cookie = implode( '; ', $cookie );curl_setopt( $ch, CURLOPT_COOKIE, $cookie );}curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );curl_setopt( $ch, CURLOPT_HEADER, true );curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );curl_setopt( $ch, CURLOPT_USERAGENT, $_GET['user_agent'] ? $_GET['user_agent'] : $_SERVER['HTTP_USER_AGENT'] );list( $header, $contents ) = preg_split( '/([\r\n][\r\n])\\1/', curl_exec( $ch ), 2 );$status = curl_getinfo( $ch );curl_close( $ch );
}// Split header text into an array.
$header_text = preg_split( '/[\r\n]+/', $header );if ( $_GET['mode'] == 'native' ) {if ( !$enable_native ) {$contents = 'ERROR: invalid mode';$status = array( 'http_code' => 'ERROR' );}// Propagate headers to response.foreach ( $header_text as $header ) {if ( preg_match( '/^(?:Content-Type|Content-Language|Set-Cookie):/i', $header ) ) {header( $header );}}print $contents;} else {// $data will be serialized into JSON data.$data = array();// Propagate all HTTP headers into the JSON data object.if ( $_GET['full_headers'] ) {$data['headers'] = array();foreach ( $header_text as $header ) {preg_match( '/^(.+?):\s+(.*)$/', $header, $matches );if ( $matches ) {$data['headers'][ $matches[1] ] = $matches[2];}}}// Propagate all cURL request / response info to the JSON data object.if ( $_GET['full_status'] ) {$data['status'] = $status;} else {$data['status'] = array();$data['status']['http_code'] = $status['http_code'];}// Set the JSON data object contents, decoding it from JSON if possible.$decoded_json = json_decode( $contents );$data['contents'] = $decoded_json ? $decoded_json : $contents;// Generate appropriate content-type header.$is_xhr = strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';header( 'Content-type: application/' . ( $is_xhr ? 'json' : 'x-javascript' ) );// Get JSONP callback.$jsonp_callback = $enable_jsonp && isset($_GET['callback']) ? $_GET['callback'] : null;// Generate JSON/JSONP string$json = json_encode( $data );print $jsonp_callback ? "$jsonp_callback($json)" : $json;}

实例：http://www.ikeepstudying.com/tools/proxy/

原文：http://benalman.com/projects/php-simple-proxy/