How to set php to be cross-domain

The way to set php to be cross-domain is to add the [header("Access-Control-Allow-Origin: *");] statement directly to the header of the php file, so that all addresses can be allowed to cross-domain requests. .

The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.

There are three ways to set up PHP to allow cross-domain access. The specific methods are as follows:

Method one:

header("Access-Control-Allow-Origin: *");//允许所有地址跨域请求

Method two:

header("Access-Control-Allow-Origin: http://localhost:8080");//指定某个地址可以跨域请求，这里只能指定一个

Method 3: If you want to allow cross-domain requests from multiple addresses, you can write like this

$origin = ['http://localhost:8080','http://localhost:8081'];
$AllowOrigin = 'http://localhost:8080';
if(in_array($_SERVER["HTTP_ORIGIN"],$origin))
{
    $AllowOrigin = $_SERVER["HTTP_ORIGIN"];
}
header("Access-Control-Allow-Origin: ".$AllowOrigin );

Set the allowed request methods, you can use * to indicate all, header("Access-Control-Allow -Methods: POST");

If the request is allowed to carry cookies, the origin configuration cannot use * at this time. At this time, the front end seems to also need to be configured so that the request carries cookie header('Access-Control-Allow-Credentials :true');

Set to allow cross-domain request headers. Login verification information is usually added to the request header. Then the server needs to specify which request headers are allowed. * cannot be used here. Use commas for multiple fields. separated. header('Access-Control-Allow-Headers:token');

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