(PHP 3>= 3.0.9, PHP 4 >= 4.0.0)
bin2hex --
Convert binary data into hexadecimal representation
User Contributed Notes
bin2hex |
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josh@superfork.com
22-Jun-1999 05:56 |
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I wrote a short function to convert the hex string back to binary.
function hex2bin($data) {
$len = strlen($data);
for($i=0;$i<$len;$i+=2) {
$newdata .= pack("C",hexdec(substr($data,$i,2)));
}
return $newdata;
}
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carl@five-ten-sg.com
11-Aug-1999 12:50 |
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function hex2bin($data) {
$len = strlen($data);
return pack("H" . $len, $data);
}
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lulu@ctyd.com.mx
14-Dec-1999 08:12 |
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Another one:
function hex2bin($hex_data){
return (DecBin(HexDec($hex_data));
}
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jon@tgpsolutions.com
16-Nov-2000 07:54 |
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PHP has a built-in function: base_convert()
$binary = base_convert($hexadecimal, 16, 2);
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pedram@redhive.com
31-Jan-2001 05:21 |
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In an attempt to dodge spam bots I've seen people (including myself) hex
encode their email addresses in "mailto" tags. This is the small
chunk of code I wrote to automate the process:
function hex_encode ($email_address) {
$encoded = bin2hex("$email_address");
$encoded = chunk_split($encoded, 2, '%');
$encoded = '%' . substr($encoded, 0, strlen($encoded) - 1);
return $encoded;
}
so for example:
<a href=/old?u=http%3A%2F%2Fwww.php.net%2Fmanual%2Fro%2F%26quot%3B%3Ca&y=1999
href="mailto:<?=hex_encode("pedram@redhive.com"">mailto:<?=hex_encode("pedram@redhive.com")?>">email
me</a>
would produce the following address:
%70%65%64%72%61%6d%40%72%65%64%68%69%76%65%2e%63%6f%6d
-pedram
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gherson at snet dot net
15-Mar-2001 12:56 |
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As is, the
function hex2bin($hex_data){
return (DecBin(HexDec($hex_data)));
}
suggested above will return actual ones and zeroes as opposed to a binary
string interpreted as ascii. E.g., "11000010110001001100011"
gets returned instead of "abc".
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tightcode@hotmail.com
25-Aug-2001 08:05 |
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I was just browsing the above and with a little modification,
came up with the following which I believe to be more flexible:
function bin2hex($data) {
$corrected =
ereg_replace("[^0-9a-fA-F]","",$data);
return pack("H".strlen($corrected),$corrected);
}
This will make sure that whatever you pass, even if it is padded
at the extremeties or between pairs, should return the desired data.
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mail@philipp-louis.de
15-Sep-2001 09:12 |
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If for some reason you want to prevent your HTML output (e.g. JavaScripts)
from being stolen by simple code thiefs or parsed by dumb bots, it might
be a good idea to encrypt it using this technique:
<?php
$output = "Blah blah blubb. ";
$output .= "Blubb blubb blah. ";
/*
Use something like this to store the output in a string instead of
echo-ing it directly to the browser.
*/
for($count = 0; $count < strlen($output); $count++)
{
$escaped .= "%" . bin2hex($output[$count]);
}
$code = "<HTML><HEAD><SCRIPT
LANGUAGE=\"javascript\">\n<!--\ndocument.write(unescape(\"$escaped\"));\n//-->\n</SCRIPT></HEAD></HTML>";
echo $code;
?>
Anyone using the browser's "view source" function will see the
following:
<HTML><HEAD><SCRIPT LANGUAGE="javascript">
<!--
document.write(unescape("%3c%50%3e%42%6c%61%68%20%62%6c%61%68%20%62%6c%75%62%62%2e%3c%2f%50%3e%3c%50%3e%42%6c%75%62%62%20%62%6c%75%62%62%20%62%6c%61%68%2e%3c%2f%50%3e"));
//-->
</SCRIPT></HEAD></HTML>
Of course this won't help against more serious efforts to steal your code,
but it will irritate the spam and copy'n'paste folks.
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maxg@hot.ee
14-Dec-2001 11:47 |
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I wrote the function that is useful for sending emails for example in
cyrillic encoding (wondows-1251, koi8-r and so on).
It converts every symbol in the string into hexadecimal presentation with
"=" symbol as delimiter.
For example, the string "Регистрационный код для" will look like
that:
=d0=e5=e3=e8=f1=f2=f0=e0=f6=e8=ee=ed=ed=fb=e9=20=ea=ee=e4=20=e4=eb=ff
I use it for encoding email subject, but it could be modified for anything
else.
function hex4email ($string,$charset)
{
$string=bin2hex ($string);
$encoded = chunk_split($string, 2, '=');
$encoded=preg_replace ("/=$/","",$encoded);
$string="=?$charset?Q?".$encoded."?=";
return $string;
};
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