What potential pitfalls should be considered when using the "unset" function in PHP?

When using the "unset" function in PHP, it is important to consider that it permanently removes a variable from memory. This means that any references to that variable will be lost, potentially causing unexpected behavior or errors in your code. To avoid this, make sure to only unset variables when necessary and be cautious of the impact it may have on other parts of your code.

$variable = "Hello World";
unset($variable); // Unset the variable
// Attempting to use $variable here will result in an error