Filter_var () Verify the format of the mailbox, IP, url php

Verify that the mailbox format is correct or not; What's your first solution?

No matter what you think, the first thing I think about is the string lookup to see if there is an @ symbol;

But for the end of. com or. NET OR. cn and so on more and more domain name verification feel tricky;

Until one day, the parameters of the Filter_var () function were studied carefully.

I am deeply ashamed to read PHP documents before.

In fact Filter_var () the second parameter Filter_validate_email can verify the mailbox, a few finishing is as follows;

2. /**
4. * Verify if it is a mailbox
6. * @param string $email mailbox
8. * @return If Boolean is a mailbox
10.  */
12. function is_email($email) {
14. if (Filter_var ($email, Filter_validate_email)) {
16. return true;
18. }else{
20. return false;
22. }
24. }
28. Var_dump (Is_email (' [email protected] '));
30. //print ture
32. Var_dump (Is_email (' baijunyao.com '));
34. //Print false

This function verifies that the rule for the mailbox is to have an @ sign, and then a full stop after the @ sign. ；

Hey? See Baijunyao.com; There is a function that can verify the URL domain name?

Yes; the second argument filter_validate_url is used to verify the URL;

2. /**
4. * Verify if it is a URL
6. * @param string $url URL
8. * @return If Boolean is a URL
10.  */
12. function is_url($url) {
14. if (Filter_var ($url, Filter_validate_url)) {
16. return true;
18. }else{
20. return false;
22. }
24. }
28. Var_dump (Is_url (' http://baijunyao.com ')); Print true
30. Var_dump (Is_url (' baijunyao.com ')); Print false
32. Var_dump (Is_url (' http://a ')); Print true

According to the printed results, it is necessary to judge whether the rules of the URL are to have http://followed by an alphanumeric number;

Of course, the second parameter is filter_validate_ip to verify whether it is an IP address;

The Filter_var is very powerful, so is it possible to pass a filter_validate_phone to verify the phone number?

nn;;; the answer is no; you think more;

This is used for cover-up;

Reprint 51059529

Filter_var () Verify the format of the mailbox, IP, url php