Function Reference/validate username

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Description

Checks whether username is valid.

Note: this function attempts to sanitize the username, and if it "passes", the name is considered valid. For additional logic, you can use the 'validate_username' hook.

Usage

%%%<?php validate_username( $username ) ?>%%%

Parameters

tt$username/tt
(string) (required) Username.
Default: Nonenoinclude

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Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环:模板:Parameter/nowiki/pre 检查到模板循环:模板:Parameter

The usage of this template is below: prenowiki检查到模板循环:模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

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Return Values

(boolean) 
Returns true if $username is valid, false if $username is invalid.

Examples

<?php
if (!empty($_POST['username']) && validate_username($_POST['username'])) {
  // Go ahead and save the user...
}
?>

Notes

Change Log

Since: 2.0.1

Source File

Before 3.0
validate_username() is located in wp-includes/registration.php.

After 3.0
validate_username() is located in wp-includes/user.php.

Related

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Description

This Template is used by Codex:Template Messages.

Usage

pre 检查到模板循环:模板:Message /pre

Result

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