How to declare an empty variable inside function in php?

@aniya.jaskolski 

In PHP, you can declare an empty variable inside a function by simply assigning a value of null to the variable. Here is an example:

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function myFunction() {
   $myVariable = null;
}

In this example, $myVariable is declared as an empty variable with a value of null. You can then assign a value to this variable later in the function if needed.