Description:
------------
The 'type.parameters' and 'disposition' elements of a body are
supposed to hold associative arrays.  Passing non associative
arrays leads to a segfault.


Test script:
---------------
<?php
$envelope = [];
$body = [[
    'type.parameters' => ['param'],
    'disposition' => ['disp'],
], [
    'type.parameters' => ['param'],
    'disposition' => ['disp'],
]];
imap_mail_compose($envelope, $body);
echo "done\n";
?>


Expected result:
----------------
done


Actual result:
--------------
segfault