Build an URL.
The parts of the second URL will be merged into the first according to the flags argument.
(part(s) of) an URL in form of a string or associative array like parse_url() returns
same as the first argument
a bitmask of binary or'ed HTTP_URL constants;
HTTP_URL_REPLACE is the default
if set, it will be filled with the parts of the composed url like parse_url() would return
"scheme" => "ftp",
"host" => "ftp.example.com",
"path" => "files/current/",
"query" => "a=c"
HTTP_URL_STRIP_AUTH | HTTP_URL_JOIN_PATH | HTTP_URL_JOIN_QUERY | HTTP_URL_STRIP_FRAGMENT
The above example will output: