Add solution 162.

Author: javadev

src/Algorithms/0162.find-peak-element/find-peak-element.php

@@ -0,0 +1,20 @@
+class Solution {
+
+    /**
+     * @param Integer[] $nums
+     * @return Integer
+     */
+    function findPeakElement($nums) {
+        if($nums==null||count($nums)<=1)return 0;
+        
+        if(count($nums)>=2){
+            if($nums[count($nums)-1]>$nums[count($nums)-2])return count($nums)-1;
+        }
+        
+        for($i=1;$i<count($nums)-1;$i++){
+            if($nums[$i]>$nums[$i-1]&&$nums[$i]>$nums[$i+1])return $i;
+        }
+        
+        return 0;
+    }
+}