When implode() is called with an array which contains a string which contains NUL ie. chr(0), the output of implode() contains garbage, from the point where the NUL ought to have occurred, onwards. The following code demonstrates this.

<?php
$buggy_string = "this bit is ok" . chr(0) . "garbagegarbagegarbage";
$ok_array = array("hello", $buggy_string);
$msg_fields = implode("|", $ok_array);

echo "buggy_string is <B>$buggy_string</B>.<BR>\n";	
echo "members of array are:<B> ";
while (list($z, $member) = each($ok_array)) 
	echo $member . ", ";
echo "</B><BR>\n";
echo "imploded array is <B>$msg_fields</B>.<BR>\n";
?>

This program's output differs with each execution, an example is:

buggy_string is this bit is okgarbagegarbagegarbage.
members of array are: hello, this bit is okgarbagegarbagegarbage, 
imploded array is hello|this bit is ok>+SELFhello|this.


My configure-string was:
./configure --with-apache=/usr/local/src/apache_1.3.9 --enable-track-vars --with-mcrypt=/usr/local/libmcrypt --with-mhash=/usr/local/mhash --with-mysql=/usr/local/mysql