php apache uses cors to achieve cross-domain

<VirtualHost *:80>
    ServerAdmin xxx@qq.com
    DocumentRoot "C:/htdocs/demo"
    ServerName dev.dd.cn
    ##ErrorLog "logs/dummy-host.localhost-error.log"
    ##CustomLog "logs/dummy-host.localhost-access.log" combined
    <Directory "C:/htdocs/demo">
        #Require all denied
        Header set Access-Control-Allow-Origin *
    </Directory>
</VirtualHost>

<?php
     header("Access-Control-Allow-Origin:*"); 
     //处理请求输出数据
?>

<VirtualHost *:80>
    ServerAdmin xxx@qq.com
    DocumentRoot "C:/htdocs/demo"
    ServerName dev.dd.cn
    ##ErrorLog "logs/dummy-host.localhost-error.log"
    ##CustomLog "logs/dummy-host.localhost-access.log" combined
    <Directory "C:/htdocs/demo">
        #Require all denied
        Header set Access-Control-Allow-Origin http://feng.com
    </Directory>
</VirtualHost>

header("Access-Control-Allow-Origin:http://feng.com");