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+2683\. Neighboring Bitwise XOR
+
+**Difficulty:** Medium
+
+**Topics:** `Array`, `Bit Manipulation`
+
+A **0-indexed** array `derived` with length `n` is derived by computing the **bitwise XOR** (⊕) of adjacent values in a **binary array** `original` of length `n`.
+
+Specifically, for each index `i` in the range `[0, n - 1]`:
+
+- If `i = n - 1`, then `derived[i] = original[i] ⊕ original[0]`.
+- Otherwise, `derived[i] = original[i] ⊕ original[i + 1]`.
+
+Given an array `derived`, your task is to determine whether there exists a **valid binary array** `original` that could have formed `derived`.
+
+Return _**true** if such an array exists or **false** otherwise_.
+
+- A binary array is an array containing only **0's** and **1's**
+
+
+**Example 1:**
+
+- **Input:** derived = [1,1,0]
+- **Output:** true
+- **Explanation:** A valid original array that gives derived is [0,1,0].
+  derived[0] = original[0] ⊕ original[1] = 0 ⊕ 1 = 1
+  derived[1] = original[1] ⊕ original[2] = 1 ⊕ 0 = 1
+  derived[2] = original[2] ⊕ original[0] = 0 ⊕ 0 = 0
+
+**Example 2:**
+
+- **Input:** derived = [1,1]
+- **Output:** true
+- **Explanation:** A valid original array that gives derived is [0,1].
+  derived[0] = original[0] ⊕ original[1] = 1
+  derived[1] = original[1] ⊕ original[0] = 1
+
+
+**Example 3:**
+
+- **Input:** derived = [1,0]
+- **Output:** false
+- **Explanation:** There is no valid original array that gives derived.
+
+
+
+**Constraints:**
+
+- `n == derived.length`
+- <code>1 <= n <= 10<sup>5</sup></code>
+- The values in `derived` are either **0's** or **1's**
+
+
+**Hint:**
+1. Understand that from the original element, we are using each element twice to construct the derived array
+2. The xor-sum of the derived array should be 0 since there is always a duplicate occurrence of each element.
+
+
+
+**Solution:**
+
+To determine whether a valid binary array `original` exists that could form the given `derived` array, we can use the properties of XOR:
+
+### Key Observations:
+1. Each `derived[i]` is the XOR of two adjacent elements in `original`:
+   - For `i = n - 1`, `derived[i] = original[n-1] ⊕ original[0]`.
+   - Otherwise, `derived[i] = original[i] ⊕ original[i+1]`.
+
+2. XOR properties:
+   - `a ⊕ a = 0` (XOR of a number with itself is 0).
+   - `a ⊕ 0 = a` (XOR of a number with 0 is the number itself).
+   - XOR is commutative and associative.
+
+3. To construct a valid `original`, the XOR of all elements in `derived` must equal 0. Why? Because for a circular XOR relationship to work (start and end wrap back to the beginning), the cumulative XOR of `derived` should cancel out.
+
+### Steps:
+1. Compute the XOR of all elements in `derived`.
+2. If the result is 0, a valid `original` exists; otherwise, it does not.
+
+### Algorithm:
+- Compute the XOR of all elements in `derived`.
+- If the XOR is 0, return `true`.
+- Otherwise, return `false`.
+
+Let's implement this solution in PHP: **[2683. Neighboring Bitwise XOR](https://github.com/mah-shamim/leet-code-in-php/tree/main/algorithms/002683-neighboring-bitwise-xor/solution.php)**
+
+```php
+<?php
+/**
+ * @param Integer[] $derived
+ * @return Boolean
+ */
+function doesValidArrayExist($derived) {
+    ...
+    ...
+    ...
+    /**
+     * go to ./solution.php
+     */
+}
+
+// Example 1
+$derived1 = [1, 1, 0];
+echo doesValidArrayExist($derived1) ? 'true' : 'false'; // Output: true
+
+// Example 2
+$derived2 = [1, 1];
+echo doesValidArrayExist($derived2) ? 'true' : 'false'; // Output: true
+
+// Example 3
+$derived3 = [1, 0];
+echo doesValidArrayExist($derived3) ? 'true' : 'false'; // Output: false
+?>
+```
+
+### Explanation:
+
+1. We initialize `$xorSum` to 0.
+2. For each element in `derived`, we XOR it with `$xorSum`.
+3. At the end of the loop, `$xorSum` will contain the XOR of all elements in `derived`.
+4. If `$xorSum` is 0, return `true`; otherwise, return `false`.
+
+### Complexity:
+- **Time Complexity:** _**O(n)**_, where _**n**_ is the length of `derived`. We only iterate through the array once.
+- **Space Complexity:** _**O(1)**_, as we only use a single variable to compute the XOR.
+
+This approach efficiently checks for the existence of a valid `original` array within the given constraints.
+
+**Contact Links**
+
+If you found this series helpful, please consider giving the **[repository](https://github.com/mah-shamim/leet-code-in-php)** a star on GitHub or sharing the post on your favorite social networks 😍. Your support would mean a lot to me!
+
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+
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diff --git a/algorithms/002683-neighboring-bitwise-xor/solution.php b/algorithms/002683-neighboring-bitwise-xor/solution.php
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+++ b/algorithms/002683-neighboring-bitwise-xor/solution.php
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+<?php
+
+class Solution {
+
+    /**
+     * @param Integer[] $derived
+     * @return Boolean
+     */
+    function doesValidArrayExist($derived) {
+        $xorSum = 0;
+
+        // Compute the XOR of all elements in derived
+        foreach ($derived as $value) {
+            $xorSum ^= $value;
+        }
+
+        // If the XOR sum is 0, a valid original array exists
+        return $xorSum === 0;
+    }
+}
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