Definition of "unset" []

• Not yet firm or solidified: unset gelatin; unset cement. (adjective)
• Not mounted in a setting: an unset gem. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It's also possible to perform additional tasks when working with the "isset ()" and "unset ()" PHP functions, but in this case by using another set of complementary functions, called "__isset ()" and "__unset ()" respectively."
• "I'm primarily a PHP programmer and I find myself calling the unset () function regularly and this is entirely down to being a little obsessive about resources."
• "I just checked your cookies and found the cookie domain to be 'unset'"