Description:
------------
The behaviour of substr_replace seems to have changed in php 5.2.2 when the length parameter is specified and is greater than the actual length of the string to modify.

With php < 5.2.2, the string is extended, with php 5.2.2 substr_replace returns false.

I don't know if this is an intended change or not, but this change is not documented in the function description.

Just in case it matters: I'm using php 5.2.2 in cli mode with apache/2.2.4 on a windows 2003 server.

Note: perhaps it is related to http://bugs.php.net/bug.php?id=40754

Thanks !

Reproduce code:
---------------
<?php
    echo PHP_VERSION, ' : ';
    var_dump(substr_replace('012', 'ABCD', 0, 4));
?>

Expected result:
----------------
either the same result as in in previous php versions
or a note in the documentation stating that the behaviour has changed.

Actual result:
--------------
with PHP 5.2.2, I get:
5.2.2 : bool(false)

With older versions of php I get:
5.2.1 : string(4) "ABCD"
5.2.0 : string(4) "ABCD"
5.1.2 : string(4) "ABCD"
5.1.1 : string(4) "ABCD"