SquirrelMail

A call to the function "fgetcsv()" with an address entry
containing an exceedingly long "email" or "label" (or any
other fields) results in breakups of a single addressbook
entry (and thus resulting in multiple entries being
loaded). A simple solution might to be customize the
byte size to whatever is comfortable for an individual
application (as in our case which is an email service
provider).

Source: Stable Release v1.4.4
/**
* abook_local_file.php
*
* @version $Id: abook_local_file.php,v 1.22.2.5
2004/12/27 15:03:42 kink Exp $
* @package squirrelmail
* @subpackage addressbook
*/

... SNIPPED...

function list_addr() {
$res = array();
$this->open();
@rewind($this->filehandle);

while ($row = @fgetcsv($this->filehandle, 2048, '|'))
{
array_push($res, array('nickname' => $row[0],
'name' => $row[1] . ' ' . $row[2],
'firstname' => $row[1],
'lastname' => $row[2],
'email' => $row[3],
'label' => $row[4],
'backend' => $this->bnum,
'source' => &$this->sname));
}
return $res;
}