Add exams from exam58 to exam98

exam82/checkfile.php

@@ -0,0 +1,13 @@
+<?php
+
+$filename = 'file.txt';
+
+if(file_exists($filename)){
+    echo 'File already exists';
+} else {
+    $handle = fopen($filename, 'w');
+    fwrite($handle, 'Nothing');
+    fclose($handle);
+}
+
+?>