Description:
------------
sqlite_escape_string on '' (the empty string) or null returns the wrong value.

I would guess that:

sqlite_escape_string ('') should return '',

and

sqlite_escape_string (null) should return null.

Additionally, you can see that what sqlite_escape_string actually does return in these cases is a mangled version of the previous non-null input string.

This bug appears to have been fixed in PHP5, but not yet in PHP4.
http://bugs.php.net/bug.php?id=29339
http://bugs.php.net/bug.php?id=29395

Reproduce code:
---------------
<?php

print bin2hex (sqlite_escape_string ('xxx')). "\n";
print bin2hex (sqlite_escape_string ('')).    "\n";
print bin2hex (sqlite_escape_string (null)).  "\n";
print "done\n";

?>


Expected result:
----------------
787878


done


Actual result:
--------------
787878
ac7878
ac7878
done