Description:
------------
parse_url doesn't support "special" characters like + or . in the scheme name anymore

Reproduce code:
---------------
<?php
// works
var_dump(parse_url("foobar://baz@bang/bla"))
// doesn't work at all
var_dump(parse_url("foo+bar://baz@bang/bla"));'
?>

Expected result:
----------------
array(4) {
  ["scheme"]=>
  string(6) "foo+bar"
  ["host"]=>
  string(4) "bang"
  ["user"]=>
  string(3) "baz"
  ["path"]=>
  string(4) "/bla"
}


Actual result:
--------------
array(2) {
  ["host"]=>
  string(7) "foo+bar"
  ["path"]=>
  string(14) "//baz@bang/bla"
}