PHP Ajax跨域问题

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

header(‘Access-Control-Allow-Origin:http://**.**‘); 

$origin = isset($_SERVER[‘HTTP_ORIGIN‘])? $_SERVER[‘HTTP_ORIGIN‘] : ‘‘;  
  
$allow_origin = array(  
    允许的域名  
);  
  
if(in_array($origin, $allow_origin)){  
    header(‘Access-Control-Allow-Origin:‘.$origin);       
}