[RFC]strn(case)cmp supporting negative length as third parameter

Hi: strn(case)cmp dosen't support a negative length as its third paramter, while substr dose. I wrote a patch to make strn(case)cmp supporting negative length, make following script works as expect: <?php if (strncmp("prefix_num", "num", -3) === 0) { echo "they have same suffix\n"; } ?> here is the rfc: https://wiki.php.net/rfc/strncmpnegativelen any question? plz worte me back. thanks -- Laruence  Xinchen Hui http://www.laruence.com/