feat: add php solution to lc problem: No.0217 (doocs#894)

No.0217.Contains Duplicate

Author: Qiu-IT

solution/0200-0299/0217.Contains Duplicate/README.md

@@ -248,6 +248,21 @@ public class Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Boolean
+     */
+    function containsDuplicate($nums) {
+        $numsUnique = array_unique($nums);
+        return count($nums) != count($numsUnique);
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0200-0299/0217.Contains Duplicate/README_EN.md

@@ -214,6 +214,21 @@ public class Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Boolean
+     */
+    function containsDuplicate($nums) {
+        $numsUnique = array_unique($nums);
+        return count($nums) != count($numsUnique);
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0200-0299/0217.Contains Duplicate/Solution.php

@@ -0,0 +1,10 @@
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Boolean
+     */
+    function containsDuplicate($nums) {
+        $numsUnique = array_unique($nums);
+        return count($nums) != count($numsUnique);
+    }
+}