PHP FILTER_VALIDATE_URL TLD not required

Question

The problem I find using filter_var($url, FILTER_VALIDATE_URL) is that it returns true when $url = "http://x";

No TLD is required. How I can solve this so a TLD is required?

Answer 1

For TLD validation you need library that operates with Public Suffix List. Here are two diffent solutions for you.

First is TLDDatabase, technicaly it's only actual database of TLDs.

$store = new LayerShifter\TLDDatabase\Store();

$store->isICCAN('com'); // returns true
$store->isICCAN('co.uk'); // returns true
$store->isICCAN('example'); // returns false

If you need more intelligent solution, I recomend TLDExtract. It's domain parser that you can use as validator.

$extract = new LayerShifter\TLDExtract\Extract();
$extract->setExtractionMode(Extract::MODE_ALLOW_ICCAN);

# For domain 'shop.github.com'

$result = $extract->parse('shop.github.com');
$result->getRegistrableDomain(); // will return 'github.com'
$result->getSuffix(); // will return 'com'    

# For domain 'shop.github.co.uk'

$result = $extract->parse('http://shop.github.co.uk');
$result->getRegistrableDomain(); // will return 'github.co.uk'
$result->getSuffix(); // will return 'co.uk'    

# For domain 'example.example'

$result = $extract->parse('https://example.example');
$result->getRegistrableDomain(); // will return NULL
$result->getSuffix(); // will return NULL

# For domain 'localhost'

$result = $extract->parse('localhost');
$result->getRegistrableDomain(); // will return NULL
$result->getSuffix(); // will return NULL