From a933ba539407df2628c21d863e4c8da827bba7a1 Mon Sep 17 00:00:00 2001
From: Qiu-IT <qiu.de@foxmail.com>
Date: Wed, 5 Jul 2023 08:41:13 +0200
Subject: [PATCH] feat: add php solution to lc problem: No.2485

---
 .../2485.Find the Pivot Integer/README.md     | 22 +++++++++++++++++++
 .../2485.Find the Pivot Integer/README_EN.md  | 22 +++++++++++++++++++
 .../2485.Find the Pivot Integer/Solution.php  | 17 ++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 solution/2400-2499/2485.Find the Pivot Integer/Solution.php

diff --git a/solution/2400-2499/2485.Find the Pivot Integer/README.md b/solution/2400-2499/2485.Find the Pivot Integer/README.md
index a48c3d8c8f7da..c9b4db337dceb 100644
--- a/solution/2400-2499/2485.Find the Pivot Integer/README.md	
+++ b/solution/2400-2499/2485.Find the Pivot Integer/README.md	
@@ -201,6 +201,28 @@ function pivotInteger(n: number): number {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer $n
+     * @return Integer
+     */
+    function pivotInteger($n) {
+        $sum = ($n * ($n + 1)) / 2;
+        $pre = 0;
+        for ($i = 1; $i <= $n; $i++) {
+            if ($pre + $i === $sum - $pre) {
+                return $i;
+            }
+            $pre += $i;
+        }
+        return -1;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/2400-2499/2485.Find the Pivot Integer/README_EN.md b/solution/2400-2499/2485.Find the Pivot Integer/README_EN.md
index e4660c1925ec0..8407038773666 100644
--- a/solution/2400-2499/2485.Find the Pivot Integer/README_EN.md	
+++ b/solution/2400-2499/2485.Find the Pivot Integer/README_EN.md	
@@ -164,6 +164,28 @@ function pivotInteger(n: number): number {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer $n
+     * @return Integer
+     */
+    function pivotInteger($n) {
+        $sum = ($n * ($n + 1)) / 2;
+        $pre = 0;
+        for ($i = 1; $i <= $n; $i++) {
+            if ($pre + $i === $sum - $pre) {
+                return $i;
+            }
+            $pre += $i;
+        }
+        return -1;
+    }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/2400-2499/2485.Find the Pivot Integer/Solution.php b/solution/2400-2499/2485.Find the Pivot Integer/Solution.php
new file mode 100644
index 0000000000000..3ff4d71c1ba5a
--- /dev/null
+++ b/solution/2400-2499/2485.Find the Pivot Integer/Solution.php	
@@ -0,0 +1,17 @@
+class Solution {
+    /**
+     * @param Integer $n
+     * @return Integer
+     */
+    function pivotInteger($n) {
+        $sum = ($n * ($n + 1)) / 2;
+        $pre = 0;
+        for ($i = 1; $i <= $n; $i++) {
+            if ($pre + $i === $sum - $pre) {
+                return $i;
+            }
+            $pre += $i;
+        }
+        return -1;
+    }
+}