I am currently testing a URL
http://localhost:8000/2.php?site=https://google.com<script></script>
Next, I proceed to sanitize the "site" parameter:
$site = filter_input(INPUT_GET, 'site', FILTER_SANITIZE_URL);
var_dump($site); // string(35) "https://google.com"
echo "<br>";
I aim to obtain a completely safe URL and then validate it:
$siteValidation = filter_var($site, FILTER_VALIDATE_URL);
var_dump($siteValidation); // bool(false)
However, the validation process fails! But why?
According to information on this website, FILTER_SANITIZE_URL does not remove special characters like < or > from the string. This explains why the output displays:
string(35) "https://google.com"
If you inspect the string with developer tools in your browser, you'll notice that the ""script"" part is still present, making the string longer than 35 characters.
This discrepancy is what causes the subsequent lines of code to fail validation.
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