Question

Need some help in porting a code from javascript to PHP

Asked by: Collis_Dam

Hello!

Please help me!
I am currently working on a small project. I have port a javascript code to PHP. Don't ask, I just have to. :)
The problem is that I can't get my PHP code work. There are some errors.
The code is an encrypting code.

********************************************************************************
The shortened html:
<form name="fa">
<textarea id="f2"></textarea>
select name="et" onchange="encN=this.selectedIndex+1">
<option selected>1
<option>2
<option>3
<option>4
<option>5
</select>
<input type="button" value="Encode" onclick="writeOut()">

********************************************************************************
The original JavaScript:
<script language="javascript">
var encN=1;
function encodeTxt(s){
s=escape(s);
var ta=new Array();
for(i=0;i<s.length;i++)ta[i]=s.charCodeAt(i)+encN;
return ""+escape(eval("String.fromCharCode("+ta+")"))+encN;
}
function writeOut(){
document.forms["fa"].output.value="<"+"script language=javascript"+">document.write(unescape('%3C%73...bla..bla..bla..%74%3E'));dF('"+encodeTxt(document.forms['fa'].f2.value)+"')<"+"/script>";
}
</script>

NOTE: I have to get this **encodeTxt(document.forms['fa'].f2.value)** part with PHP!


My PHP code is not working! I think I've done my best, I am really just a beginner. Please help!

The error msg is:
Notice: Undefined offset: 67 in \\.host\Shared Folders\htdocs\encoder\encoder.php on line 29

Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in \\.host\Shared Folders\htdocs\encoder\encoder.php(32) : eval()'d code on line 1
2          ( I don't know what is this number 2.. Maybe the final string?)

Please help me to fix my code!
Maybe just a few fix, but I can't do more!

Thank you! You are my only hope!

If it's help, the original result of the Javascript (that I want) for "ssp_1-10_img (000).jpg" (without quotes) in the **encodeTxt(document.forms['fa'].f2.value)** part (that I need) is:
ttq%602.21%60jnh%2631%2639111%263%3A/kqh1

********************************************************************************
My PHP code (extracted to a snippet for readability and line numbering by mplungjan, ee zape):

<?php //first line -- lines here are not edited, because of the line counting.
 
$encN = 1;
 
$txt = "ssp_1-10_img (000).jpg";
$codeKey = 1; // options are: 0 | 1 | 2 | 3 | 4
$encN = $codeKey+1;
 
function escape($str) {
	$str = bin2hex($str);
	$r="";
	for( $a=0; $a<strlen($str); $a+=2 )
	{	
		$r.="%".$str{$a}.$str{$a+1};
	}
	$r = strtoupper($r);
	return $r;
}
 
function encodeTxt($s){
	global $encN;
	$r="";
	$s = escape($s);
	$ta = array();
	for ($i=1; $i<=strlen($s); $i++) {
		$ta{$i} = ord(substr($s, $i, 1))+$encN;
	}
	for ($j=1; $j<=$i; $j++) {
		$r.= chr($ta{$j});
	}
	
	$r = escape(eval($r)).$encN;
	return $r;
}
 
echo encodeTxt($txt);
 ?>
                                  
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Asked On
2009-06-04 at 20:37:26ID24465952
Tags

javascript to php

,

encrypting

,

porting

Topics

PHP Scripting Language

,

JavaScript

,

Algorithms

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: mms_masterPosted on 2009-06-05 at 04:42:15ID: 24555359

Hi,

I've fixed the errors and made some changes. It's not outputting the correct value yet. I'm at work at the moment and have to go do something. But maybe you can finish it. If not, I'll do some more work on it as soon as I get 5 minutes.

mms_master

<?php //first line -- lines here are not edited, because of the line counting.
 
$encN = 1;
 
$txt = "ssp_1-10_img (000).jpg";
$codeKey = 1; // options are: 0 | 1 | 2 | 3 | 4
$encN = $codeKey+1;
 
function encodeTxt($s){
	global $encN;
	$r="";
	$s = rawurlencode($s);
 
	$ta = array();
	for ($i=0; $i<=(strlen($s)-1); $i++) {
		$ta{$i} = ord(substr($s, $i, 1)) + $encN;
	}
 
	for ($j=0; $j<=(count($ta)-1); $j++) {
		$r.= rawurlencode(chr($ta{$j}));
	}
 
	$r .= $encN;
 
	return $r;
}
 
$txt = encodeTxt($txt);
 
echo $txt;
 ?>

                                              
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by: storm_swPosted on 2009-06-05 at 04:45:02ID: 24555372

<pre id="codeSnippet337997" class="prettyprint">$ta{$i} ==> $ta[$i]</pre>

 

by: storm_swPosted on 2009-06-05 at 04:46:09ID: 24555381

For array your have to use square brackets: []

 

by: Collis_DamPosted on 2009-06-05 at 07:18:01ID: 24556657

When testing, set $codeKey = 0;  (NOT 1)  when in JS: var codeKey=1;
or $encN = $codeKey+1;  =>  $encN = $codeKey;

@mms_master:
Hey, thank you! Your code is really close to work perfect.
The only problem is this:

ttq%602.21%60jnh%2631%2639111%263%3A/kqh1     //Generated by JS
ttq%602.21%60jnh%2631%2639111%263%3A%2Fkqh1     //Generated by PHP


 

by: Collis_DamPosted on 2009-06-05 at 07:30:12ID: 24556800

OK, I just checked it and the JS decoder both works with
ttq%602.21%60jnh%2631%2639111%263%3A/kqh1 and with
ttq%602.21%60jnh%2631%2639111%263%3A%2Fkqh1


Maybe because I use them to encode image URLs, and it displays them. So thank you!! You made my day! :)

I would be very happy if you could describe YOUR code in just 2-3 lines, because I would like to learn, not just copy&past :)
I know that rawurlencode() but I hadn't use it because I tested a string "abcde" and it gives back "abcde". It just escaping the special chars. While JS escape() makes "%61%62%63%64%65" from "abcde".
Thats why (and maybe because I'm a beginner) I dont understand that how can your code work. But it works!
So solution accepted, and thank you again! Just please help me to understand it :)

 

by: Collis_DamPosted on 2009-06-05 at 07:34:10ID: 31589100

Thank you! Accepted, it works! But I would be very happy if you could please describe your code in just 2-3 lines, because I would like to learn, not just copy&past :) And thank you again!

 

by: mms_masterPosted on 2009-06-06 at 08:45:42ID: 24563354

@storm_sw
Well spotted I missed that!

@Collis_Dam

First of all this is why you were getting errors:

Error:
"Notice: Undefined offset: 67 in \\.host\Shared Folders\htdocs\encoder\encoder.php on line 29"

Reason:
On line 28 you had "for ($j=1; $j<=$i; $j++) {". You were trying to use $i which had been declared in the previous 'for' loop but not this one.  For more information on this try searching Google for "variable scope".

Fix:
I replaced $i with count($ta). Which as you probably know or guessed, returns the number of items in the array.

Error:
"Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in \\.host\Shared Folders\htdocs\encoder\encoder.php(32) : eval()'d code on line 1"

Reason:
The eval() function evaluates PHP code. You were passing an invalid string to it. See www.php.net/eval for more information.

Fix:
Removed the eval function.

I then removed your escape function and used rawurlencode instead. But yes as you pointed out, javascritps escape function encodes all characters where as the php function only encode special characters. To replicate the javascript output you would need to write your own function as you tried to with escape. If you try this you would need to use ord() before bin2hex().

mms_master

 

by: Collis_DamPosted on 2009-06-11 at 11:37:19ID: 24605364

@mms_master:

It's nice from you to come back and write again after you've already got your points! :)
Thank you again!

20120131-EE-VQP-002

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