What is the purpose of the unset function in PHP?

In PHP, the unset() function is used to destroy a specific variable. It serves several purposes, such as:

1. After calling the unset() function, the memory space occupied by the variable will be released, allowing it to be used by other variables or data.
2. Remove elements from an array: When the unset() function is passed an array and a key as parameters, it will delete the element corresponding to that key in the array.
3. Destroying Object Properties: When the unset() function is passed an object and a property name as parameters, it will destroy the specified property of that object.

It is important to note that the unset() function can only be used to destroy variables, arrays, and object properties, and cannot be used on other types of data, such as constants or functions.