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# PHP unset() Function [PHP Available Functions](#) The **unset()** function is used to destroy the given variable. PHP Version: PHP 4, PHP 5, PHP 7 ### Syntax void unset ( mixed $var [, mixed $... ] ) Parameter Explanation: * $var: The variable to be destroyed. ### Return Value No return value. ### Example ## Example If you unset() a global variable inside a function, only the local variable is destroyed, and the variable in the calling environment will retain the same value it had before unset() was called. ## Example The output will be: bar If you want to unset() a global variable inside a function, you can use the $GLOBALS array to achieve this: ## Example If you unset() a variable passed by reference inside a function, only the local variable is destroyed, and the variable in the calling environment will retain the same value it had before unset() was called. ## Example The above example will output: something something If you unset() a static variable inside a function, the static variable will be destroyed within the function. However, when the function is called again, the static variable will be restored to its value before it was destroyed. ## Example The above example will output: Before unset: 1, after unset: 23Before unset: 2, after unset: 23Before unset: 3, after unset: 23 [PHP Available Functions](#)