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(PECL pecl_http >= 0.10.0)
http_send_content_type — Send Content-Type
$content_type  = "application/x-octetstream" 
  ] )Send the Content-Type of the sent entity.
Note: 此函数应与 http_send_data() , http_send_file() 和 http_send_stream() 一同使用。
content_type the desired content type (primary/secondary)
   成功时返回  TRUE , 或者在失败时返回  FALSE 。
  
   Raises an  E_WARNING  when the content_type 
   doesn't seem to contain a primary and a secondary part.