(PECL pecl_http >= 0.10.0)
http_match_request_header — Match any header
$header
   , string $value
   [, bool $match_case = false
  ] )Match an incoming HTTP header.
headerthe header name (case-insensitive)
valuethe header value that should be compared
match_casewhether the value should be compared case sensitively
   Returns TRUE if header value matches, else FALSE.