添加 0001.两数之和 PHP版本

problems/0001.两数之和.md

@@ -224,6 +224,31 @@ func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
 }
 ```
 
+PHP:
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @param Integer $target
+     * @return Integer[]
+     */
+    function twoSum($nums, $target) {
+        if (count($nums) == 0) {
+            return [];
+        }
+        $table = [];
+        for ($i = 0; $i < count($nums); $i++) {
+            $temp = $target - $nums[$i];
+            if (isset($table[$temp])) {
+                return [$table[$temp], $i];
+            }
+            $table[$nums[$i]] = $i;
+        }
+        return [];
+    }
+}
+```
+
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