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This article mainly introduces the PHP form must verify which fields, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian with you to understand.

PHP form-required fields

Field validation rules

Name is required. + can only contain letters and spaces

E-mail is required. + must contain a valid email address (including "@" and ".")

The web address is optional. If it exists, it must contain a valid URL

Remarks are optional. Multiline fields (text fields).

Gender is required. One must be selected.

:

PHP forms-validate messages and URL

Now let's learn how to verify names (name), e-mails (email), and URLs.

.

PHP-verify name

The following code detects whether the name field contains letters and spaces in a simple way, and outputs an error message if the name field value is illegal:

$name = test_input ($_ POST ["name"])

If (! preg_match ("/ ^ [a-zA-Z] * $/", $name)) {

$nameErr = "only letters and spaces are allowed"

}

.

Preg_match-regular expression matching is performed.

Http://www.iis7.com/a/lm/gjcpmcx/

Syntax: int preg_match (string $pattern, string $subject [, array $matches [, int $flags]])

Search the subject string for something that matches the regular expression given by pattern. If matches is provided, it is populated with the search results. $matches [0] will contain text that matches the entire pattern, $matches [1] will contain text that matches the subpattern in parentheses that was captured first, and so on.

.

PHP-validate messages

The following code will detect whether the e-mail address is valid in a simple way. If the e-mail address is invalid, an error message will be output:

$email = test_input ($_ POST ["email"])

If (! preg_match ("/ ([\ w\ -] +\ @ [\ w\ -] +\. [\ w\ -] +) /", $email)) {

$emailErr = "illegal mailbox format"

}

.

PHP-verify URL

The following code detects whether the URL address is valid (the following regular expression runs URL with a dash: "-"), and if the URL address is illegal, an error message will be output:

$website = test_input ($_ POST ["website"])

If (! preg_match ("/\ b (: (?: https? | ftp):\ /\ / | www\.) [- a-z0-9 thanks thanks #\ /%? = ~ _ |!:,.;] * [- a-z0-9 thanks / /% = ~ _ | / I", $website)) {

$websiteErr = "illegal URL address"

}

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