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J
even this simple code
<html>
<head>
<title>t</title>
</head>
<body>
<?php
if(!isset($_POST["sub"]) or ($_POST["sub"]!="OK")){
?>
<form action="t.php" method="post" enctype="multipart/form-data">
<input type="file" name="f"><br>
<input type="Submit" name="sub"...
