imap_savebody
  (PHP 5 >= 5.1.3, PHP 7, PHP 8)
imap_savebody — Save a specific body section to a file
  
 
 
  参数
  
   
    - 
imap
- IMAP\Connection 实例。 
- file
- 
      
       The path to the saved file as a string, or a valid file descriptor
       returned by fopen().
       
- message_num
- 
      
       The message number
       
- section
- 
      
       The part number. It is a string of integers delimited by period which
       index into a body part list as per the IMAP4 specification
       
- flags
- 
      
       A bitmask with one or more of the following:
        
        - 
         
          FT_UID- Themessage_numis a UID
- 
         
          FT_PEEK- Do not set the \Seen flag if
          not already set
- 
         
          FT_INTERNAL- The return string is in
          internal format, will not canonicalize to CRLF.
 
 
 
  返回值
  
   成功时返回 true, 或者在失败时返回 false。