Here's a concise answer to your PHP interview question:
In PHP, both unset() and assigning null to a variable can be used to free up memory occupied by a variable. However, there are some differences in their behavior and implications:
unset() function
The unset() function completely removes the variable from memory and the symbol table.
It frees up the memory occupied by the variable and its value.
Using unset() on a variable makes it unavailable for further use until it is reassigned a value.
unset() can be used to remove multiple variables at once by passing them as arguments separated by commas.
Assigning null to a variable
Assigning null to a variable sets its value to the null constant, which represents a variable with no valu...
