Description:
------------
I know:
php5.1.0 has this problem
php5.1.6 has this problem
php5.0.5 does not have this problem
php5.2-win32-200609211830 does not have this problem
php6.0-win32-200609211630 does not have this problem

I assume:
php >= 5.1.0 <= 5.1.6 has this problem
php4.x does not have this problem
php >= 5.0.0 < 5.1.0 does not have this problem

I have tested this on both Win32 and Linux.

Reproduce code:
---------------
<?php
echo "before\n";

// Any of these lines should reproduce the segfault
echo strtotime( "lastyear" );
echo strtotime( "skdfhakshdlastyearslkdjflksjd" );
echo strtotime( "lastyearslkdjflksjd" );
echo strtotime( "skdfhakshdlastyear" );
echo strtotime( "thisthursday" );
echo strtotime( "nextyear" );
echo strtotime( "lastmonth" );
echo strtotime( "lastsecond" );

echo "\nafter\n";
?>


Expected result:
----------------
Depending on the line above and how it is determined to handle non-separated keywords:

before
1127397439
after

---- OR ----

before

after


Actual result:
--------------
before
Segmentation fault