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 nsapi_request_headers    (PHP 4 >= 4.3.3, PHP 5) nsapi_request_headers -- Fetch all HTTP request headers 说明array  nsapi_request_headers ( void  ) 
   nsapi_request_headers() gets all the HTTP headers in
   the current request. This is only supported when PHP runs as a 
   NSAPI module.
   注: 
    Prior to PHP 4.3.3, getallheaders() was only 
    available for the Apache servers.  After PHP 4.3.3,
    getallheaders() is an alias for
    nsapi_request_headers() if you use the NSAPI module.
    
 注: 
    You can also get at the value of the common CGI variables by
    reading them from the $_SERVER superglobal, which 
    works whether or not you are using PHP as a 
    NSAPI module.
    
 返回值
   Returns an associative array with all the HTTP headers.
   例
    例子 1. nsapi_request_headers() example 
<?php $headers = nsapi_request_headers();
  foreach ($headers as $header => $value) {   echo "$header: $value <br />\n"; } ?>
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