Description:
------------
pathinfo() and parse_url() doesn't handle null characters

Reproduce code:
---------------
/* test 1*/
var_dump(pathinfo("file.p\x00hp"));

/* test 2 */
var_dump(pathinfo("fi\x00le.php"));

/* test 3 */
var_dump(parse_url("./file.php"));

/* test 4 */
var_dump(parse_url("./fi\x00le.php"));

Expected result:
----------------
(\0 means null character)

/* test 1 */

array(3) {
  ["dirname"]=>
  string(1) "."
  ["basename"]=>
  string(9) "file.p\0hp"
  ["extension"]=>
  string(4) "p\0hp"
}

/* test 2 */

array(3) {
  ["dirname"]=>
  string(1) "."
  ["basename"]=>
  string(9) "fi\0le.php"
  ["extension"]=>
  string(4) "php"
}

/* test 3 */

array(1) {
  ["path"]=>
  string(10) "./file.php"
}

/* test 4 */

array(1) {
  ["path"]=>
  string(10) "./fi\0le.php"
}

Actual result:
--------------
/* test 1 */

=> OK

/* test 2 */

array(3) {
  ["dirname"]=>
  string(1) "."
  ["basename"]=>
  string(9) "fi\0le.php"
}

Extension should be "php".

/* test 3 */

=> OK

/* test 4 */

array(1) {
  ["path"]=>
  string(10) "./fi"
}