<?php
// venn_diagram.php

if (isset($_GET['mode'])) {
  if ($_GET['mode'] != '' && isset($_POST['mydurl']) && isset($_POST['myfname'])) {
   if (strlen(str_replace(".png*", "", ($_POST['myfname'] . "*"))) != strlen(($_POST['myfname'] . "*")) && strlen(str_replace("*venn_diagram_", "", ("*" . $_POST['myfname']))) != strlen(("*" . $_POST['myfname']))) {
    $idata = base64_decode($_POST['mydurl']);
    file_put_contents($_POST['myfname'], $idata);
   }
  } 
}

?>