index.html

<html>
<body>
    
<form action="/upload/check_usr.php" method="post">    
Usr: <input type="text" name="usr" size="40" maxlength="80" value="" />
Passwd: <input type="text" name="passwd" size="40" maxlength="80" value="" />
<input type="submit" name="submit" value="SUBMIT"/>
</form>    
 
</body>
</html>

check_usr.php

<?php  
session_start();  	
    $usr = $_POST['usr'];   
    $passwd = $_POST['passwd'];  
    $_SESSION['usr'] = "yourUsrName";//your name here
    $_SESSION['passwd'] = "yourPasswd";//your password here
    if ($passwd != $_SESSION['passwd'] && $usr != $_SESSION['usr']){echo "ERROR";}
    elseif ($passwd == $_SESSION['passwd'] && $usr == $_SESSION['usr']){
?> 
<!--if usrname & passwd are correct-->
<form action="upload_file.php" method="post" target="post_frame" enctype="multipart/form-data" id="editor-form" name="form1">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" />
<input type="hidden" name="filepath" />
<input type="submit" name="submit" value="Submit" />
</form> <div id="ooo"> </div>
<!--jq ajax upload, require jquery.form.js-->   
<script type="text/javascript" src="/jquery.min.js"></script>   <script src="/jquery.form.js"></script> 
<script type="text/javascript">
$(document).ready(function() {
  $('#editor-form').submit(function() {
    var options = {target: '#ooo',url: 'upload_file.php',type: 'post',success: function() {$('#filepath').val($('#ooo').text());}};
    $(this).ajaxSubmit(options);
    return false;
  });
});
</script>
<?php }?>

upload_file.php

<?php 
$dir = 'files/';
if (! file_exists ( $dir )) {
mkdir ( $dir );//create a folder if not exists
}
if ((
($_FILES["file"]["type"] == "application/octet-stream")//.rar/.exe/.7z etc.
|| ($_FILES["file"]["type"] == "application/x-zip-compressed")//.zip
|| ($_FILES["file"]["type"] == "application/javascript"))//.js
&& ($_FILES["file"]["size"] < 200000)
) {
  if ($_FILES["file"]["error"] > 0) {echo "Return Code: " . $_FILES["file"]["error"] ;
  } else {
    if (file_exists("files/" . $_FILES["file"]["name"])) {
     echo $_FILES["file"]["name"] . " already exists. ";
    } else {
      move_uploaded_file(     $_FILES["file"]["tmp_name"],      "files/"  . $_FILES["file"]["name"] );// save file	
      }
    }
  } else {echo "Invalid file";}  
?>

php_upload_system is coded by http://xiaohudie.net. Any posts here is one hundred percent original, so please keep my link so as not to hurt this pretty girl. -小蝴蝶