PhpLabel
v::phpLabel()
Validates if a value is considered a valid PHP Label, so that it can be used as a variable, function or class name, for example.
Reference: http://php.net/manual/en/language.variables.basics.php
v::phpLabel()->validate('person'); //true
v::phpLabel()->validate('foo'); //true
v::phpLabel()->validate('4ccess'); //false
See also: