mailparse_msg_extract_part()

(PECL mailparse >= 0.9.0)

Extracts/decodes a message section

说明

mailparse_msg_extract_part(resource $mimemail,string $msgbody[,callable $callbackfunc]): void

Warning

本函数还未编写文档，仅有参数列表。

参数

$mimemail

A validMIMEresource.

$msgbody

$callbackfunc

返回值

没有返回值。

参见

• mailparse_msg_extract_part_file()Extracts/decodes a message section
• mailparse_msg_extract_whole_part_file()Extracts a message section including headers without decoding the transfer encoding

The callback argument does not support closures... :( It will complains with "PHP Catchable fatal error: Object of class Closure could not be converted to string".

substr() uses the string length, not the position as third argument. The corrected version of the following code line:
<?php
$parts[$s] = substr($file_txt, $starting_pos_body, $ending_pos_body-$starting_pos_body);
?>

In mailparse version 2.1.1 (and perhaps earlier), when using mailparse_msg_extract_part() with a callback function, it breaks the data it passes to it into 4kB chunks and calls the callback function for each chunk. So, for example, if it's extracting a 41kB MIME part, the callback function you define will be called 11 times, each time with the next chunk of data. Here's some quick-and-dirty code that shows one way to handle this:
<?php
  $message = file_get_contents ("email.txt"); // Pull in the e-mail.
  function catch_part ($part)
  {
    $GLOBALS["part_data"] .= $part; // Append the data onto any previously extracted data.
  }
  mailparse_msg_extract_part ("1.1", $message, "catch_part"); // Extract MIME part 1.1
  echo $GLOBALS["part_data"]; // Print out the extracted part.
?>
There's probably a much better way of dealing with this, but hey. It's what I got.

With ref to previous comment re: callback:
If you explicitly specify NULL as the callback parameter, the complete section is extracted, decoded and returned, without the need for a callback.

Unless I've missed something obvious:
get_structure returns array(1,1.1,1.1.2) etc but its not easy to get the contents of each part as mailparse_msg_extract_part() and mailparse_msg_extract_part_file() just return the lot. However get_part_data will return the string offsets so you know where to chop the message so you can get the contents of the parts.
Only issue is get_part_data returns:
  [starting-pos] => 0
  [starting-pos-body] => 1412
  [ending-pos] => 14989
  [ending-pos-body] => 14989
Unless I'm missed something else, theres a bug here as ending-pos is the same as ending-pos-body so it won't chop the contents cleanly, leaving the:
------=_NextPart_000_0069_01C659A6.9072E590--
...as supposedly part of the section contents.
$file = "..../mail"; // path of your mail
$file_txt = implode("",file($file));
$parse = mailparse_msg_parse_file($file); 
$structure = mailparse_msg_get_structure($parse);
// chop message parts into array
$parts = array();
foreach ($structure as $s){
  print "Part $s\n";
  print "--------------------------------------\n";
  $part = mailparse_msg_get_part($parse, $s);
  $part_data = mailparse_msg_get_part_data($part);
  print_r($part_data);
  $starting_pos_body = $part_data['starting-pos-body'];
  $ending_pos_body  = $part_data['ending-pos-body'];
  $parts[$s] = substr($file_txt,$starting_pos_body,$ending_pos_body); // copy data into array
  print "[".$parts[$s]."]";
  print "\n------------------------------------\n";
}