February 12, 2011 
Definition:
function validate_username( $username ) {}
Checks whether an username is valid.
Parameters
- string $username: Username.
Return values
returns:Whether username given is valid
Defined filters
- validate_username
apply_filters( 'validate_username', $valid, $username )
Source code
function validate_username( $username ) {
$sanitized = sanitize_user( $username, true );
$valid = ( $sanitized == $username );
return apply_filters( 'validate_username', $valid, $username );
}
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