feat: add php solution to lc problem: No.0169 (doocs#955)

Author: Qiu-IT

solution/0100-0199/0169.Majority Element/README.md

@@ -199,6 +199,27 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Integer
+     */
+    function majorityElement($nums) {
+        $major = 0;
+        $count = 0;
+        for ($i = 0; $i < count($nums); $i++) {
+            if ($count == 0) $major = $nums[$i];
+            if ($major == $nums[$i]) $count++;
+            else $count--;
+        }
+        return $major;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0100-0199/0169.Majority Element/README_EN.md

@@ -169,6 +169,27 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Integer
+     */
+    function majorityElement($nums) {
+        $major = 0;
+        $count = 0;
+        for ($i = 0; $i < count($nums); $i++) {
+            if ($count == 0) $major = $nums[$i];
+            if ($major == $nums[$i]) $count++;
+            else $count--;
+        }
+        return $major;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0100-0199/0169.Majority Element/Solution.php

@@ -0,0 +1,16 @@
+class Solution {
+    /**
+     * @param Integer[] $nums
+     * @return Integer
+     */
+    function majorityElement($nums) {
+        $major = 0;
+        $count = 0;
+        for ($i = 0; $i < count($nums); $i++) {
+            if ($count == 0) $major = $nums[$i];
+            if ($major == $nums[$i]) $count++;
+            else $count--;
+        }
+        return $major;
+    }
+}