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);
+}
+
+?>

exam82/file.txt

@@ -0,0 +1 @@
+Nothing

exam82/files/firstfile.txt

@@ -0,0 +1 @@
+First file

exam82/files/secondfile.txt

@@ -0,0 +1 @@
+Second File

exam82/files/thirdfile.txt

@@ -0,0 +1 @@
+Third file

exam82/listingFiles.php

@@ -0,0 +1,16 @@
+<?php
+
+$directory = 'files';
+
+if ($handle = opendir($directory.'/')){
+    echo 'Looking inside \'' . $directory . '\': <br>';
+
+    while($file = readdir($handle)){
+        if ($file != '.' && $file != '..') {
+            echo '<a href="'.$directory.'/'.$file.'">'.$file.'</a><br>';
+        }
+    }
+
+}
+
+?>

exam82/rdfiles.php

@@ -0,0 +1,22 @@
+<?php
+
+$filename = 'filetodelete.txt';
+
+if(@unlink($filename)){
+    echo 'File <strong>'. $filename .'</strong> has been deleted';
+} else {
+    echo 'File cannot be deleted!';
+}
+
+$file = 'filetorename.txt';
+$rand = rand(10000,99999);
+
+if(@rename($file,$rand.'txt')){
+    echo 'File has been renamed successfully to ' . $rand;
+} else {
+    echo 'File cannot be renamed!';
+}
+
+
+
+?>