Description:
------------
fwrite() writes given data to the file when length paramenter is given as a negative value.

This is only applicable to php6.


Reproduce code:
---------------
<?php
 $fp = fopen("test.dat", "w");
 $data = "data";
 var_dump(fwrite($fp, $data, -10) );
 fclose($fp);
 var_dump(readfile("test.dat") );
 unlink("test.dat");
?>


Expected result:
----------------
int(0)
int(0)


Actual result:
--------------
int(4)
dataint(4)