From e6975415370067128b8a625944fedec91728f4fc Mon Sep 17 00:00:00 2001
From: nolanzzz <nolanwork131@gmail.com>
Date: Thu, 2 Sep 2021 23:53:36 -0400
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200015.=E4=B8=89=E6=95=B0?=
 =?UTF-8?q?=E4=B9=8B=E5=92=8C=20PHP=E7=89=88=E6=9C=AC?=
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---
 problems/0015.三数之和.md | 40 +++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/problems/0015.三数之和.md b/problems/0015.三数之和.md
index 1adb2d24..adb9a113 100644
--- a/problems/0015.三数之和.md
+++ b/problems/0015.三数之和.md
@@ -393,6 +393,46 @@ function threeSum(array $nums): array
 }
 ```
 
+PHP:
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Integer[][]
+     */
+    function threeSum($nums) {
+        $res = [];
+        sort($nums);
+        for ($i = 0; $i < count($nums); $i++) {
+            if ($nums[$i] > 0) {
+                return $res;
+            }
+            if ($i > 0 && $nums[$i] == $nums[$i - 1]) {
+                continue;
+            }
+            $left = $i + 1;
+            $right = count($nums) - 1;
+            while ($left < $right) {
+                $sum = $nums[$i] + $nums[$left] + $nums[$right];
+                if ($sum < 0) {
+                    $left++;
+                }
+                else if ($sum > 0) {
+                    $right--;
+                }
+                else {
+                    $res[] = [$nums[$i], $nums[$left], $nums[$right]];
+                    while ($left < $right && $nums[$left] == $nums[$left + 1]) $left++;
+                    while ($left < $right && $nums[$right] == $nums[$right - 1]) $right--;
+                    $left++;
+                    $right--;
+                }
+            }
+        }
+        return $res;
+    }
+}
+```
 
 
 -----------------------