What does the empty function do in PHP?

The empty function is used to check if a variable is empty. It takes a variable as a parameter and returns a boolean value indicating if the variable is empty.

The empty function will return true when a variable is in the following condition:

1. The variable does not exist or is null.
2. The variable is an empty string (“”).
3. Variable is set to 0 (integer type)
4. The variable is set to 0.0 (floating point).
5. The variable is set to “0” (string type)

Empty function will only return false in cases other than the ones mentioned above.