Like mentioned by php at maisqi dot com, this function does not support IDN, and instead for reinventing the wheel we can use the idn_to_ascii function in the intl module.
Example:
<?php
function validateUrl($url)
{
$idn = idn_to_ascii($url);
return filter_var($idn, FILTER_VALIDATE_URL);
}
?>
How it works, is that idn_to_ascii converts the multi-byte url to a punycode ascii string. Below is the example in these docs
<?php
echo idn_to_ascii('täst.de');
?>
Returns: xn--tst-qla.de
This is the actual url stored in the DNS
That string can also be reversed by using idn_to_utf8()
----
Server IP: 69.147.83.197
Probable Submitter: 46.9.207.119
----
Manual Page -- http://www.php.net/manual/en/function.filter-var.php
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