PHP sets multiple domain names to allow cross-domain access

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.

Recommended tutorial: PHP tutorial

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