The **`Ds\Set::xor()` function** in PHP returns the XOR (exclusive-OR) of two sets.
> The **XOR** of two sets A and B, contains all the elements that are either in set A or set B, but not in both. It can be calculated as:
> A XOR B = (A Union B) - (A Intersection B)

For example, consider two sets A and B such that: 

A = {1, 2, 3, 4}

B = {3, 4, 5, 6}

The XOR of A and B can be calculated as:


A Union B = {1, 2, 3, 4, 5, 6}

A Intersection B = {3, 4}

A XOR B  = {1, 2, 3, 4, 5, 6} - {3, 4}

A XOR B = {1, 2, 5, 6}


# 
## Syntax
The `xor()` function can be declared as shown in the code snippet below:
```php
Ds\Set public Ds\Set::xor ( Ds\Set $set )
```
* **`set`**: This is the set with which to calculate the XOR.

## Return value
The `xor()` function returns a set that contains the resulting set after computing the XOR of two sets.

## Example
The code snippet below demonstrates the use of the `xor()` function.

<?php 
  
$s1 = new \Ds\Set([1, 2, 3, 4]); 
  
$s2 = new \Ds\Set([3, 4, 5, 6]); 
  
echo("xor(s1, s2): \n"); 
  
print_r($s1->xor($s2));
  
?>

phpDS

## Explanation
* Line 3: We declare a set named `s1`.
* Line 5: We declare a set named `s2`. 
* Line 9: The `xor()` function returns the XOR of `s1` and `s2`.

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What is the Ds\Set xor() function in PHP?

Returns the XOR of two sets, containing elements either in set A or set B, but not both.