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(PHP 4, PHP 5, PHP 7)
imap_body — Read the message body
$imap_stream 
   ,  int $msg_number 
   [,  int $options  = 0 
  ] )  imap_body()  returns the body of the message,
   numbered msg_number in the current
   mailbox.
  
imap_body() will only return a verbatim copy of the message body. To extract single parts of a multipart MIME-encoded message you have to use imap_fetchstructure() to analyze its structure and imap_fetchbody() to extract a copy of a single body component.
imap_stream 由 imap_open() 返回的 IMAP 流。
msg_number The message number
options 
       The optional options are a bit mask
       with one or more of the following:
       
FT_UID  - The msg_number is 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.
          Returns the body of the specified message, as a string.
[#1] Anonymous [2014-01-27 08:44:34]
Documentation lacks the information that you can use | -character to combine multiple options
[#2] paddywwoof [2011-01-26 05:09:09]
NB the message numbers start from 1 not 0 as normally used for iterating.
[#3] deenfirdoush at gmail dot com [2009-12-14 19:08:40]
Simple example on how to read body message of the recent mail.
<?php
$imap = imap_open("{pop.example.com:995/pop3/ssl/novalidate-cert}", "username", "password");
if( $imap ) {
    
     //Check no.of.msgs
     $num = imap_num_msg($imap);
     //if there is a message in your inbox
     if( $num >0 ) {
          //read that mail recently arrived
          echo imap_qprint(imap_body($imap, $num));
     }
     //close the stream
     imap_close($imap);
}
?>