How PHP uses the filter function to verify mailboxes, URLs, and IP addresses

PHP program to verify the mailbox, IP address or URL in general, we will use regular expressions to deal with, in fact, there are some built-in PHP special validation rules. Here's an example of how to use the PHP built-in filter function to validate Email,ip and URLs.

1, verify the mailbox

$email = ' Alixixi@163.com '; 
$result =filter_var ($email, filter_validate_email); 
Var_dump ($result);
Output: String ' Alixixi@163.com '

2. Verify URL Address

$url = ' http://www.Alixixi.com/'; 
$result =filter_var ($url, filter_validate_url); 
Var_dump ($result);
Output: String ' http://www.Alixixi.com/'

3. Verify IP Address

$url = ' 192.168.0.1 '; 
$result =filter_var ($url, filter_validate_ip); 
Var_dump ($result);
Output: String (11) ' 192.168.0.1 '

The filter function in PHP can also be used to verify floating point numbers, shaping digits, Boolean types, and so on, you can refer to the PHP manual filter function or refer to this site as follows this article

PHP Filter_var () function Filter function

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