From 211f9f28dd6ed9f9540cd5feac9c8e9bd9f80568 Mon Sep 17 00:00:00 2001
From: SevenMonths <qinwen_shuai@163.com>
Date: Tue, 24 May 2022 14:39:04 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=EF=BC=880344.=E5=8F=8D?=
 =?UTF-8?q?=E8=BD=AC=E5=AD=97=E7=AC=A6=E4=B8=B2.md=EF=BC=89=EF=BC=9APHP?=
 =?UTF-8?q?=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 problems/0344.反转字符串.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/problems/0344.反转字符串.md b/problems/0344.反转字符串.md
index 58bada05..583d4f78 100644
--- a/problems/0344.反转字符串.md
+++ b/problems/0344.反转字符串.md
@@ -267,5 +267,34 @@ public class Solution
 }
 ```
 
+PHP：
+```php
+// 双指针
+// 一：
+function reverseString(&$s) {
+    $left = 0;
+    $right = count($s)-1;
+    while($left<$right){
+        $temp = $s[$left];
+        $s[$left] = $s[$right];
+        $s[$right] = $temp;
+        $left++;
+        $right--;
+    }
+}
+
+// 二：
+function reverseString(&$s) {
+    $this->reverse($s,0,count($s)-1);
+}
+// 按指定位置交换元素
+function reverse(&$s, $start, $end) {
+    for ($i = $start, $j = $end; $i < $j; $i++, $j--) {
+        $tmp = $s[$i];
+        $s[$i] = $s[$j];
+        $s[$j] = $tmp;
+    }
+}
+```
 -----------------------
 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>