Add exams from exam156 to exam199

exam164/index.php

@@ -0,0 +1,27 @@
+<?php 
+session_start();
+
+
+if(!isset($_POST['secure'])){
+    $_SESSION['secure'] = rand(1000, 9999);
+}else {
+    if($_POST['secure'] == $_SESSION['secure']){
+        echo 'You are not robot';   
+    } else {
+        echo 'Try again';
+        $_SESSION['secure'] = rand(1000, 9999);
+    }
+}
+   
+
+
+
+?>
+<br>
+<img src="generate.php"/><br>
+
+<form action="index.php" method="POST">
+    Write a number from picture:
+    <input type="text" size="6"name="secure">
+    <input type="submit" value="Submit">
+</form>