使用全局变量将值从模板传递到标头。

// in the template file  

global $my_page_title;  
$my_page_title = \'field value\';  

global $my_meta_description;  
$my_meta_description = \'field value\';  

get_header();  

// in the header file  
global $my_page_title;  
global $my_meta_description;  

echo $my_page_title;  
echo $my_meta_description;