more fun with file io

.gitignore

@@ -1,3 +1,4 @@
 *.log
 *.pid
 docroot/nginx.conf
+docroot/html/writable/*.*

docroot/html/files.php

@@ -40,5 +40,74 @@ mkheader('files!', '#aaa');
 
     ?></pre>
 
+
+    <!-- ======================================================= -->
+    <pre><?php
+
+    $handle = fopen('data.txt', 'r');
+    $first24chars = fread($handle, 24);
+    fclose($handle);
+
+    print $first24chars;
+
+    ?></pre>
+
+
+    <!-- ======================================================= -->
+    <pre><?php
+
+    $outfile = 'writable/fileio-' . time() . '-' . rand() . '.txt';
+    $handle = fopen($outfile, 'w');
+
+    $outdata = $_GET['out'] ? $_GET['out'] . "\n" : "Like this?\n";
+
+    fwrite($handle, $outdata);
+    fclose($handle);
+
+    print "<a href=/$outfile>wrote stuff</a>";
+
+    ?></pre>
+
+
+    <!-- ======================================================= -->
+    <?php
+
+    $datastore = 'writable/datastore.txt';
+    if (file_exists($datastore)) {
+        $data = file_get_contents($datastore);
+    } else {
+        $data = "";
+    }
+
+    if ($_SERVER['REQUEST_METHOD'] == "GET") {
+        ?>
+        <form name="datastore" action="" method="POST">
+        <textarea name="data" rows="10" cols="80"><?php
+        print $data;
+        ?></textarea>
+
+        <input type="submit" name="submit" value="Save" />
+        </form>
+        <?php
+
+    } else {
+
+        $data = $_POST['data'];
+        $handle = fopen($datastore, 'w');
+        fwrite($handle, str_replace(array("\r\n"), "\n", $data));
+        fclose($handle);
+
+        ?>
+        <p>Saved!</p>
+        <p>
+          <em><a href="<?php echo $_SERVER['PHP_SELF']; ?>">clear this message</a></em>
+        </p>
+
+        <?php
+    }
+
+    ?>
+
+
   </body>
 </html>