How to make a variable private to a trait?

How to make a variable private to a trait?

References

Reference NO 1

http://stackoverflow.com/questions/13582747/how-to-make-a-variable-private-to-a-trait

Reference NO 2

http://stackoverflow.com/questions/13659968/using-a-trait-to-change-a-variable-in-another-class-results-in-slower-performanc

Reference NO 3

http://php.net/manual/en/language.oop5.traits.php

Reference NO 4

http://kennethjorgensen.com/blog/2012/03/06/on-php-5-4-and-traits/

Reference NO 5

http://www.bennadel.com/blog/2181-Private-Variables-Do-Not-Necessarily-Break-Prototypal-Inheritance-In-Javascript.htm

Reference NO 6

http://rmod.lille.inria.fr/archives/papers/Cuts09a-ECOOP09-Traits.pdf

Reference NO 7

http://www.scalatest.org/user_guide/other_goodies

Reference NO 8

http://www.sitepoint.com/using-traits-in-php-5-4/