Simple PHP Encoder 1.0

<?php

/* PHP Encoder 1.0
   Simple Script by Altenator IWnet ( all function credit to Prakhar Prasad )
   - Add Cartabylamine PHP Encoder (http://pastebin.com/SH7MXKng)
*/

echo "<center><br><form method='post'><textarea name='php_input' rows='15' cols='70' ></textarea>
<br><br><input type='submit' name='submit_php_input' value='encode this rubbish'></input></form></center>";

function rstr() //Random String Function
{
 $len=rand(3,6);
 $chr='';
 for($i=1;$i<=$len;$i++)
 {
  $chr.=rand(0,1) ? chr(rand(65,90)) : chr(rand(97,122));
 }
 return $chr;
}

function enjumble($data) //Custom Encoding + Base64 + gzinflate()
{
 for($i=0;$i<strlen($data);$i++)
 {
  $data[$i]=chr(ord($data[$i])+1);
 }
 return base64_encode(gzdeflate($data,9));
}

function enjumble1($data) //Custom Encoding + Base64 + gzinflate(data,1)
{
 for($i=0;$i<strlen($data);$i++)
 {
  $data[$i]=chr(ord($data[$i])+1);
 }
 return base64_encode(gzdeflate($data,1));
}

function striptag($in) //Remove '<?php' from initial code
{
 $pos = strpos($in,"<?php"); //to do: add support for short_tags
 if(is_numeric($pos))
 {
  for($i=$pos;$i<=$pos+4 && strlen($in) >=5;$i++)
  {
  $in[$i]=' ';
  }
  return $in;
 }
 else
 {
 return $in;
 }
}
function makeoutfile($str)  //make output string that have been encode
{ $funcname=rstr();
$varname='$'.rstr();
$template=
"<?php function ".$funcname."($varname)
{
$varname=gzinflate(base64_decode($varname));
 for(\$i=0;\$i<strlen($varname);\$i++)
 {
".$varname."[\$i] = chr(ord(".$varname."[\$i])-1);
 }
 return $varname;
 }eval($funcname(\"";
  $str=enjumble($str);
 $template = $template . $str."\"));?>";
 return $template;
}

function makeoutfile1($str)  //make output string that have been encode (using function ejumble1)
{ $funcname=rstr();
$varname='$'.rstr();
$template=
"<?php function ".$funcname."($varname)
{
$varname=gzinflate(base64_decode($varname));
 for(\$i=0;\$i<strlen($varname);\$i++)
 {
".$varname."[\$i] = chr(ord(".$varname."[\$i])-1);
 }
 return $varname;
 }eval($funcname(\"";
  $str=enjumble1($str);
 $template = $template . $str."\"));?>";
 return $template;
}

if (isset($_POST['submit_php_input'])) {
    if (isset($_POST['php_input'])) {
        $php_input=$_POST['php_input'];
    }

if ($php_input=="") {
    echo "Nothing inserted !";
} else {
    $outdata_1 = makeoutfile(striptag($php_input));
    $outdata = makeoutfile1(striptag($outdata_1));
    echo "<center><textarea name='php_input' rows='15' cols='70'>$outdata</textarea></center>";
}
}

?>