unset() destroys the specified variables and returns true.
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.
The above example would output:If a variable that is PASSED BY REFERENCE 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.
function foo(&$bar) {
unset($bar);
$bar = "blah";
}
$bar = 'something';
echo "$bar\n";
foo($bar);
echo "$bar\n";
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If a static variable is unset() inside of a function, unset() unsets the reference to the static variable, rather than the static variable itself.
The above example would output:If you would like to unset() a global variable inside of a function, you can use the $GLOBALS array to do so: