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This article will explain in detail how php verifies whether the user name begins with a letter and verifies the password. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The details are as follows:

Verify that the user name begins with a letter and the verification password can only be a combination of numbers and letters, three commonly used verification functions: verify the email address format, verify that the password can only be a combination of numbers and letters, and verify that the user name begins with a letter code, this is used when the user registers or when submitting the form.

Function is_email ($email)

{

If (preg_match ("/ [a-za-z0-9] + @ [a-za-z0-9] +. [Amurz] {2mer4} /", $email,$mail))

{

Return true

}

Else

{

Return false

}

}

/ * *

* verify that the user name begins with a letter

, /

Function is_user_name ($user)

{

If (preg_match ("/ ^ [a-za-z] {1} ([a-za-z0-9] | [. _]) {3jue 19} $/", $user,$username)

{

Return true

}

Else

{

Return false

}

}

/ * *

* verify that the password can only be a combination of numbers and letters

, /

Function is_psd ($psd)

{

If (preg_match ("/ ^ (w) {4pm 20} $/", $psd,$password))

{

Return true

}

Else

{

Return false

}

}

This is the end of the article on "how php verifies whether the user name begins with a letter and verifies the password". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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