From ab5b82969f30b767f2815883272f4b3a49ad0c82 Mon Sep 17 00:00:00 2001
From: SevenMonths <qinwen_shuai@163.com>
Date: Tue, 31 May 2022 15:56:00 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9E(0150.=E9=80=86=E6=B3=A2?=
 =?UTF-8?q?=E5=85=B0=E8=A1=A8=E8=BE=BE=E5=BC=8F=E6=B1=82=E5=80=BC.md)?=
 =?UTF-8?q?=EF=BC=9Aphp=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
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---
 problems/0150.逆波兰表达式求值.md | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/problems/0150.逆波兰表达式求值.md b/problems/0150.逆波兰表达式求值.md
index fd3d69aa..7e142ba3 100644
--- a/problems/0150.逆波兰表达式求值.md
+++ b/problems/0150.逆波兰表达式求值.md
@@ -326,5 +326,29 @@ func evalRPN(_ tokens: [String]) -> Int {
 }
 ```
 
+PHP：
+```php
+class Solution {
+    function evalRPN($tokens) {
+        $st = new SplStack();
+        for($i = 0;$i<count($tokens);$i++){
+            // 是数字直接入栈
+            if(is_numeric($tokens[$i])){ 
+                $st->push($tokens[$i]);
+            }else{ 
+                // 是符号进行运算
+                $num1 = $st->pop();
+                $num2 = $st->pop();
+                if ($tokens[$i] == "+") $st->push($num2 + $num1);
+                if ($tokens[$i] == "-") $st->push($num2 - $num1);
+                if ($tokens[$i] == "*") $st->push($num2 * $num1);
+                // 注意处理小数部分
+                if ($tokens[$i] == "/") $st->push(intval($num2 / $num1));
+            }
+        }
+        return $st->pop();
+    }
+}
+```
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