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The behavior of unset() inside of a function can vary depending on what type of variable you are attempting to destroy. ... If a globalized variable is unset() inside of a function, only the local variable is destroyed. The variable in the calling environment will retain the same value as before unset() was called.
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session_unset — Free all session variables ... void session_unset ( void ) ... The session_unset() function frees all session variables currently registered.
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Unset - Wikipedia, the free encyclopedia
unset is a Unix shell command. It unsets a shell variable, removing it from memory and the shell's exported environment. It is implemented as a shell built-in, because it directly manipulates the int...
en.wikipedia.org/wiki/Unset |
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lhs =. removes any rules defined for lhs. ... Rules are removed only when their left-hand sides are identical to lhs, and the tests in Condition given on the right-hand side are also identical. See The Mathematica Book on the ... Documentation Mathematica Teacher's Edition Built-in Functions Programming Assignments...
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in its first form sets a panel option to TRUE. The command ... set and unset panel options; ... sets a panel option to FALSE. The command...
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unset -- Unset a given variable ... unset() destroys the specified variables. Note that in PHP 3, unset() will always return TRUE (actually, the integer value 1). In PHP 4, however, unset() is no longer a true function: it is now a statement.
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Syntax unset [-fv] [name] Options -f The names refer to shell Functions, and the function definition is removed. Readonly variables and functions may not be unset. -v Each name refers to a shell Variable (default)
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unset - Delete variables ... The unset command returns an empty string as result. If -nocomplain is specified as the first argument, any possible errors are suppressed. The option may not be abbreviated, in order to disambiguate it from possible variable names.
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