(PECL pecl_http >= 0.13.0)
HttpResponse::guessContentType — Guess content type
$magic_file
[, int $magic_mode = MAGIC_MIME
] )Attempts to guess the content type of supplied payload through libmagic.
If the attempt is successful, the guessed Content-Type will automatically be set as response Content-Type.
magic_file
specifies the magic.mime database to use
magic_mode
flags for libmagic
Returns the guessed content type on success 或者在失败时返回 FALSE.
Throws HttpRuntimeException, HttpInvalidParamException.