Description:
------------
RUN this and see the output .... prety serious BUG i think

Reproduce code:
---------------
<?
$lines[0]="a;1";
$lines[1]="b;1";
$lines[2]="c;1";
$lines[3]="d;1";

print_r($lines);
foreach ($lines as $line_num => &$line) {
	$cell = explode(";", $line);
	$cell[1] = str_replace('1', '2', $cell[1]);
	$line = implode (";", $cell);
}

print_r($lines);
echo ("<br/>");

foreach ($lines as $line_num => $line) {
	echo $line_num." = ".$line."<hr>";
}
?>

Expected result:
----------------
last line shloud be last line ...

Actual result:
--------------
last line is taken from line before previous line