PHP filter_var函数什么都不输出

Question

I have the following code:

$email = 'test@example.com';
echo $email.'<br>';
echo filter_var('test@example.com',FILTER_SANITZE_EMAIL).' SANITIZED-EMAIL';

and it the output is as follows:

test@example.com
SANITIZED-EMAIL

Clearly the email is completely turned into an empty string. Similarly the filter_var with FILTER_SANITIZE_STRING does the same thing. What am I missing here?

Answer 1

Your code does give errors:

Notice: Use of undefined constant FILTER_SANITZE_EMAIL - assumed 'FILTER_SANITZE_EMAIL' in /var/www/html/test.php on line 4

Warning: filter_var() expects parameter 2 to be long, string given in /var/www/html/test.php on line 4 SANITIZED-EMAIL

It has to be FILTER_SANITIZE_EMAIL not FILTER_SANITZE_EMAIL - so it's just a typo.