Description:
------------
FILTER_VALIDATE_URLS rejects URLs starting with "phar:///".

Test script:
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<?php

var_dump(filter_var('file://c:/path/to/dir', FILTER_VALIDATE_URL));
var_dump(filter_var('file:///path/to/dir', FILTER_VALIDATE_URL));
var_dump(filter_var('phar://c:/path/to/dir', FILTER_VALIDATE_URL));
var_dump(filter_var('phar:///path/to/dir', FILTER_VALIDATE_URL));

Expected result:
----------------
string(21) "file://c:/path/to/dir"
string(19) "file:///path/to/dir"
string(21) "phar://c:/path/to/dir"
string(19) "phar:///path/to/dir"


Actual result:
--------------
string(21) "file://c:/path/to/dir"
string(19) "file:///path/to/dir"
string(21) "phar://c:/path/to/dir"
bool(false)