How php verifies that the user name begins with a letter and verifies the password
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
}
}
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