PHP Methods for validating mailboxes, URLs, and IP addresses using the filter function _php Tutorial

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

1, verify the mailbox

$email = ' phpernote@163.com '; $result =filter_var ($email, Filter_validate_email); Var_dump ($result);//output: string (+) ' phpernote@163.com '

2. Verify the URL address

$url = ' http://www.phpernote.com/'; $result =filter_var ($url, Filter_validate_url); Var_dump ($result);//output: string (+) ' http://www.phpernote.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 the floating-point number, shaped numbers, Boolean types, etc., can be consulted in the PHP manual filter function or reference to the site as follows this article

PHP Filter_var () function Filter function

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