(PHP 4, PHP 5)
imap_headerinfo — Read the header of the message
Gets information about the given message number by reading its headers.
由 imap_open() 返回的 IMAP 流。
The message number
Number of characters for the fetchfrom property. Must be greater than or equal to zero.
Number of characters for the fetchsubject property Must be greater than or equal to zero.
Returns the information in an object with following properties: