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Set multiple domain names for PHP language to allow cross-domain access
Server variables:
Server variables are stored in the $_SERVER array. There is a special Key value: HTTP_ORIGIN. This key will only have a value when it is cross-domain, and it will be an empty string when it comes from the same origin
Response header settings allow access to a certain domain name: access-control-allow-origin
The header function can be set to allow cross-domain access for a certain domain name, in the form of header('access_control_allow_origin:*').
Posted code:
$allow_origin = array( 'a.baidu.com', 'b.baidu.com', ); //跨域访问的时候才会存在此字段 $origin = isset($_SERVER['HTTP_ORIGIN']) ? $_SERVER['HTTP_ORIGIN'] : ''; if (in_array($origin, $allow_origin)) { header('Access-Control-Allow-Origin:' . $origin); } else { return; }
note: When requesting the interface through the interface tool, the $_SERVER['HTTP_ORIGIN'] variable is also an empty string.
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