access-control-allow-origin php,PHP通过Access-Control-Allow-Origin 跨域

通过设置Access-Control-Allow-Origin来实现跨域。

例如：

客户端的域名是client.xxx.com，而请求的域名是server.xxx.com。

如果直接使用ajax访问，会有以下错误：

XMLHttpRequest cannot load http://server.xxx.com/server.php. No 'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'http://client.xxx.com' is therefore not allowed access.

1、允许单个域名访问

指定某域名(http://client.xxx.com)跨域访问，则只需在server.php文件头部添加如下代码：

header('Access-Control-Allow-Origin:http://client.xxx.com');

// 指定允许其他域名访问

//header('Access-Control-Allow-Origin:*');

// 响应类型

//header('Access-Control-Allow-Methods:POST');

// 响应头设置

//header('Access-Control-Allow-Headers:x-requested-with,content-type');

2、允许多个域名访问

指定多个域名(http://client1.xxx.com、http://client2.xxx.com等)跨域访问，则只需在server.php文件头部添加如下代码：

$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';

$allow_origin = array(

'http://client1.xxx.com',

'http://client2.xxx.com'

);

if(in_array($origin, $allow_origin)){

header('Access-Control-Allow-Origin:'.$origin);

}

3、允许所有域名访问

允许所有域名访问则只需在server.php 文件头部添加如下代码：

header('Access-Control-Allow-Origin:*');

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access-control-allow-origin php,PHP通过Access-Control-Allow-Origin 跨域

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