How to clear static variable in PHP?

How to clear static variable in PHP?

php function someFunction($clear_static = false) { static $variable = null; if ($clear_static) { $variable = null; } do stuff; change value of $variable; do stuff; someFunction(); # The value of $variable persists through the recursion. return ($variable); } someFunction(); # first manual call.

How do you clear a static variable?

The only way to reset a static variable is as follows.

  1. private static float myVariable = 0;
  2. // Change myVariable.
  3. // Call this function to reset.
  4. void Reset () {
  5. myVariable = 0;
  6. }

How to clear a variable in PHP?

The unset() function in PHP resets any variable. If unset() is called inside a user-defined function, it unsets the local variables. If a user wants to unset the global variable inside the function, then he/she has to use $GLOBALS array to do so. The unset() function has no return value.

Can static variables be changed in PHP?

Actually, static variables in PHP are not static at all.. their values can be changed during execution. It’s just a shared variable of a class.

What is the use of isset () and unset ()?

The isset () function is used to check whether a variable is set or not. If a variable is already unset with unset() function, it will no longer be set. The isset() function return false if testing variable contains a NULL value. More variable to be checked.

Which function is used to delete a variable in PHP?

The unset() function is a predefined variable handling function of PHP, which is used to unset a specified variable. In other words, “the unset() function destroys the variables”.

Can static variables be garbage collected?

Static variables cannot be elected for garbage collection while the class is loaded. They can be collected when the respective class loader (that was responsible for loading this class) is itself collected for garbage.

Can I change the value of static variable?

Static methods cannot access or change the values of instance variables or the this reference (since there is no calling object for them), and static methods cannot call non-static methods. However, non-static methods have access to all variables (instance or static) and methods (static or non-static) in the class.

Can we change the static variable value?

Static methods cannot access or change the values of instance variables or the this reference (since there is no calling object for them), and static methods cannot call non-static methods.

How do you clear an Isset?

Syntax : unset($variable1, $variable2, $variable3, $…..); This predefined function is used to clear or unset a specified variable in the php script.

Is static variable stored in heap?

After the java 8 version, static variables are stored in the heap memory.

Where are static variables stored?

data segment
The static variables are stored in the data segment of the memory. The data segment is a part of the virtual address space of a program. All the static variables that do not have an explicit initialization or are initialized to zero are stored in the uninitialized data segment( also known as the BSS segment).

How do you modify a static variable?

Example of static method

  1. //Java Program to demonstrate the use of a static method.
  2. class Student{
  3. int rollno;
  4. String name;
  5. static String college = “ITS”;
  6. //static method to change the value of static variable.
  7. static void change(){
  8. college = “BBDIT”;

Can we override static variable?

No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time.