chop

addslashes

Last updated: Fri, 18 Jul 2008

bin2hex

(PHP 4, PHP 5)

bin2hex — Converte i dati binari nella rappresentazione esadecimale

Descrizione

string bin2hex ( string $str )

La funzione restituisce una stringa ASCII contenente la rappresentazione esadecimale del parametro str . La conversione viene eseguita byte per byte considerando prima il semi-byte più significativo.

Vedere anche pack() e unpack().

chop

addslashes

Last updated: Fri, 18 Jul 2008

add a note User Contributed Notes
bin2hex

chaos79
03-Oct-2008 08:30


Because the way back (hex2bin) doesn't exist on php, i've written another little function without using commands like pack:



<?php

// Convert a hex-string to binary-string (the way back from bin2hex)



function hex2bin($h)

  {

  if (!is_string($h)) return null;

  $r='';

  for ($a=0; $a<strlen($h); $a+=2) { $r.=chr(hexdec($h{$a}.$h{($a+1)})); }

  return $r;

  }



echo bin2hex('Hello'); // result: 48656c6c6f

echo hex2bin('48656c6c6f'); // result: Hello

?>

admin at purespider dot de
15-Aug-2008 05:08


The most simple way to do binary (10101010 or so) to hex is

<?PHP echo dechex(bindec(10101010)); ?>

PHPcoder at cyberpimp dot t28 dot net
15-Jan-2008 02:11


Re. Matt W. and bin2hex vs. hexdec...



The compliment of bin2hex is actually pack('H*', $hex_str), where $hex_str is the ASCII hexadecimal string (ordered high nibble first) to convert to an 8-bit (binary-safe) STRING of data.



hexdec, as explained in the documentation, converts a hexadecimal value to a decimal number.  It returns a PHP NUMERIC value, not a string!



So just a quick recap:



For STRING conversions...



    ... bin2hex($any_str) converts an 8-bit (binary-safe) string of data to an ASCII hex string.

    ... pack('H*', $hex_str) converts an ASCII hex string to an 8-bit (binary-safe) string of data.



For NUMERIC conversions...



    ... hexdec($hex) converts an ASCII string representation of a number in hex to a PHP numeric value (I'm guessing integer).

    ... dechex($int) converts an integer to an ASCII string representation of the value in hex.



    ... bindec($str) converts a string of ASCII 0's and 1's (representing a binary value) to a PHP numeric value (I'm guessing integer).

    ... decbin($int) converts an integer to a string of ASCII 0's and 1's representing the value in binary.



    ... octdec($str) converts an ASCII string representation of a number in octal to a PHP numeric value (I'm guessing integer).

    ... decoct($int) converts an integer to an ASCII string representation of the value in octal.



And of course as every PHP programmer should know, PHP internally handles type conversion between ASCII string representations of base-10 numbers and PHP numeric values (integer, float, etc.).



Be wary of your data types!  Binary data strings are not the same as PHP numeric values!

Matt W.
14-Jan-2008 10:53


In case anyone's looking for the complement of bin2hex, which I assumed would be hex2bin, it's actually named hexdec: http://www.php.net/hexdec.

codeguru at crazyprogrammer dot cba dot pl
03-Jan-2008 04:06


<?php

function ASCIItoANSI($text2encode,$m=Null){

    if ($m<>0){$mode = "&amp;";}else{$mode = chr(38);}

    // starting loop incl. lenght of base string

    for ($i=0;$i<=strlen($text2encode)-1;++$i)

        {       

            // add first  & char  # char + converted 2 ANSI codes  

            $ANSI .= $mode.chr(35).hexdec(bin2hex($text2encode[$i]));

        }

echo $ANSI; // Here`s Really string contains ANSI codes

}



// **************** U S A G E ********************//

//     ASCIItoANSI     (String or $SomeVar);  

//    ^^^^^ returns converted 2 ANSI 

// ^^^ [ Can be used on WWW ] 

//     ASCIItoANSI     (String or $SomeVar,1); 

//    ^^^^^^ returns converted 2 ANSI in View mode 

// ^^^ [ Can`t be used on WWW ]

//++++++++++++++  E X A M P L E S ++++++++++++++++//

// FIRST SAMPLE:Sample Conversion

//

ASCIItoANSI     ("PHP Power! => ");

/* 

show: PHP Power! => 

but

really output is:

&#67&#114&#97&#122&#121&#80&#114&#111&#103

&#114&#97&#109&#109&#101&#114&#32&#116&#101

&#115&#116&#105&#110&#103&#32&#65&#83&#67

&#73&#32&#50&#32&#65&#78&#83&#73&#32&#99

&#111&#110&#118&#101&#114&#115&#105&#111&#110

*/

ASCIItoANSI     ("PHP Power! => ",1);

/* 

show: &#80&#72&#80&#32&#80&#111&#119&#101

&#114&#33&#32&#61&#62&#32

but

really output is: &amp;#80&amp;#72&amp;

#80&amp;#32&amp;#80&amp;#111&amp;#119

&amp;#101&amp;#114&amp;#33&amp;#32&amp;

#61&amp;#62&amp;#32

*/

?>

<br><br>

<!-- MAIL PROTECT EXAMPLE (BASIC)-->

1 Sample 

<a href="

<? ASCIItoANSI(

"mailto:codeguru@crazyprogrammer.cba.pl");?>"

>Mail me</a> 

<!-- MAIL PROTECT EXAMPLE (ADVANCE)-->

2 Sample 

<a href="

<? ASCIItoANSI(

"mailto:codeguru@crazyprogrammer.cba.pl?subject=php&body=question"

);?>"

><? ASCIItoANSI(

"codeguru@crazyprogrammer.cba.pl"

);?></a>

kissifrot at gmail dot com
26-Nov-2007 02:37


hex2bin can be useful to insert data into BLOB binary fields.



for example if you want to insert the content of a file :



<?php

$filename = '/foo/bar';

$bin_content = fread(fopen($filename,"r"),filesize($filename));



// use the usual mysql_connect() function



$insert_query = "INSERT INTO mytable (blob_field) VALUES ('".bin2hex($bin_content)."')";

mysql_query($insert_query);



?>

tehjosh at gamingg dot net
11-Aug-2007 11:35


This function is for converting binary data into a hexadecimal string representation.  This function is not for converting strings representing binary digits into hexadecimal.  If you want that functionality, you can simply do this:



<?php

$binary = "11111001";

$hex = dechex(bindec($binary));

echo $hex;

?>



This would output "f9".  Just remember that there is a very big difference between binary data and a string representation of binary.

ratfactor at gmail dot com
23-Nov-2006 12:13


I also wished to have the ability to translate a string containing a binary number ('1101') to a string containing a hexadecimal number ('d').  Here is my function:



function strbin2hex($bin){

  $last = strlen($bin)-1;

  for($i=0; $i<=$last; $i++){ $x += $bin[$last-$i] * pow(2,$i); }

  return dechex($x);

}



Example:

strbin2hex('1101');   // returns 'd'



I also added some optional features to my function (zero padding and upper case hex letters):



function strbin2hex($bin, $pad=false, $upper=false){

  $last = strlen($bin)-1;

  for($i=0; $i<=$last; $i++){ $x += $bin[$last-$i] * pow(2,$i); }

  $x = dechex($x);

  if($pad){ while(strlen($x) < intval(strlen($bin))/4){ $x = "0$x"; } }

  if($upper){ $x = strtoupper($x); }

  return $x;

}



Examples:

strbin2hex('11110101', true, true);   // returns 'F5'

strbin2hex('00001011', true, true);   // returns '0B'

nilzie at gmail dot com
14-Jul-2006 06:12


Since PHP only has a way to convert a real binary string into hex, couldn't I find a function that can convert binary information written in ascii (like 0110). This function will convert that



<?

function asciibin2hex($str) {



$str = str_replace(" ", "", $str); //delete some probably spaces



//Binary to HEX list



$binary['0000'] = "0";

$binary['0001'] = "1";

$binary['0010'] = "2";

$binary['0011'] = "3";

$binary['0100'] = "4";

$binary['0101'] = "5";

$binary['0110'] = "6";

$binary['0111'] = "7";

$binary['1000'] = "8";

$binary['1001'] = "9";

$binary['1010'] = "a";

$binary['1011'] = "b";

$binary['1100'] = "c";

$binary['1101'] = "d";

$binary['1110'] = "e";

$binary['1111'] = "f";



//make sets of 4

for( ; ; ) {

$calc = strlen($str) / 4;

if(is_numeric($calc)&&(intval($calc)==floatval($calc))) {

    break;

    }

    else {

        $str .= 0;

        }

 }



//translate binary to hex

for($i = 0 ; $i < strlen($str) ; $i = $i + 4) {

        $set = substr($str, $i, 4);

        $inhex .= $binary[$set];

}



return $inhex;



}

//Examples:

echo asciibin2hex("101101011100"); //prints: b5c

echo asciibin2hex("1011 1000 1111 1100") //prints: b8fc

echo asciibin2hex("1000 1011 1101 001") //prints: 8bd2

?>



I hope I didn't make it too hard for myself writing this all, but hé, it works :)

mike at go dot online dot pt
14-Mar-2006 04:03


Unicode/multibyte capable 'bin2hex' function, inspired by v0rbiz at yahoo dot com >> http://www.php.net/manual/en/function.ord.php#42778



function unibin2hex($u) {

    $k = mb_convert_encoding($u, 'UCS-2LE', 'UTF-8');

    $k1 = bin2hex(substr($k, 0, 1));

    $k2 = bin2hex(substr($k, 1, 1));

    return $k2.$k1;

}



Note: UCS-2LE = UCS-2 little endian; UCS-2 = UTF-16

Viking Coder
25-Jan-2006 01:28


The simplest way to do a true hex2bin (not ascii 1s & 0s).



pack("H*", $hex);

stroppytux at gmail dot com
13-Aug-2005 03:28


The other way to do this pedram, is to do this:

$encoded= strrev(chunk_split(strrev(bin2hex("test@mail.com")), 2, '%'));

lihong dot wei at mwbiz dot de
18-May-2005 05:15


Convert special characters(inclusiv line break) in a string into hexadecimal characters

function spec2hex($str) {

   $result = '';

   for($i = 0; $i < strlen($str); $i++) {

           if(ord(substr($str, $i, 1)) > 127 || ord(substr($str, $i, 1)) == 10){

               $result .= '&#x'.bin2hex(substr($str, $i, 1)).';';

           }

           else{

               $result .= substr($str, $i, 1);

           }

   }

   return $result;

}

php_guru �t bestof d�sh inter d�t net
03-Feb-2005 12:15


The function hexentities($str) of the previous post is equivalent to



<?= substr( chunk_split( bin2hex( " $str" ), 2, ";&#x" ), 3,-3) ?>



Also, I think that the <address> tag should be used for the whole paragraph (usually at document foot) and not as shortcut for <span class=email> or so (although it is an %inline; element), see e.g. http://www.w3.org/TR/html4/struct/global.html#h-7.5.6

manithu at fahr-zur-hoelle dot org
09-Jan-2005 01:30


This function returns the string $str in htmlentity hex format (&#xnumber;).

It is useful to prevent spam bots indexing your email adress.



<?php



function hexentities($str) {

    $return = '';

    for($i = 0; $i < strlen($str); $i++) {

        $return .= '&#x'.bin2hex(substr($str, $i, 1)).';';

    }

    return $return;

}



?>



example:

<?php echo 'email: <address>'.hexentities('foo@bar').'</address>'; ?>

will return: 



email: <address>&#x66;&#x6f;&#x6f;&#x40;&#x62;&#x61;&#x72;</address>



the browser will show foo@bar.

j_lozinskit at yahoo dot co dot uk
24-Nov-2004 05:11


A good option for creating strings with binary data for saving (for example saving an sql statement to a file) into text files or php code is to do the following:



<?php

$field=bin2hex($field);

$field=chunk_split($field,2,"\\x");

$field= "\\x" . substr($field,0,-2);

?>



this will convert your field (binary or not) into hex and then convert the hex into a string which may be placed in a php file:



FFFFFFFF -> \xFF\xFF\xFF\xFF

t0rus at dr dot com
22-Nov-2004 08:18


modified version of Thoth's hexbin and binhex to convert 

any size numbers 

(original doesn't take more than integer - 32bit)

<?

function hexbin($hex){

    $bin='';

    for($i=0;$i<strlen($hex);$i++)

        $bin.=str_pad(decbin(hexdec($hex{$i})),4,'0',STR_PAD_LEFT);

       return $bin;

} 



function binhex($bin){

    $hex='';

    for($i=strlen($bin)-4;$i>=0;$i-=4)

        $hex.=dechex(bindec(substr($bin,$i,4)));

   return strrev($hex);

}

?>

brams006 at umn dot edu
19-Aug-2004 03:05


Here's a modified version of an earlier post (asc2bin and bin2asc) to convert an incoming ascii string to hex and out again.  For example, this is really useful if you want to insert data into a mySQL database which contains both escaped and non-escaped characters.  For example, if you want to store code snibbets in a mySQL text field:



printf("here's some \"text\".");



If you INSERT this into mySQL, it probably won't come out in friendly executable format, and you can't escape all double-quotes, nor can you strip out all the slashes.  One solution is to just convert the string to hex, store it in hex, then convert back to ascii before using it in some way:



function asc2hex ($temp) {

   $len = strlen($temp);

   for ($i=0; $i<$len; $i++) $data.=sprintf("%02x",ord(substr($temp,$i,1)));

   return $data;

}



function hex2asc($temp) {

   $len = strlen($temp);

   for ($i=0;$i<$len;$i+=2) $data.=chr(hexdec(substr($temp,$i,2)));

   return $data;

}

RT
20-May-2004 12:45


The easiest way of all to convert a hex string to ascii is:





<?


pack("H*", $your_hex_string);


?>

aidan at php dot net
30-Apr-2004 08:48


hexdump() is a function for "dumping" packets or binary output from servers. See the below link for more information.





http://aidanlister.com/repos/v/function.hexdump.php

mhspam at mail dot sce dot cz
23-Apr-2004 07:14


My version of quoted-printable mail subject converting function (maybe not as effective, but preserving characters which don't need conversion).

Martin

<?php

// Transfer mail subject into Quoted Printable encoding

function mail_quote_subj($str, $charset){

    $out = '';

    for($i = 0; $i < strlen($str); $i++){

        $out .= (ord($str[$i]) > 127) ? "=" . bin2hex($str[$i]) : $str[$i];

    }

    return "=?$charset?Q?".$out."?=";

};

?>

AntonioAlcorn at yahoo dot coma
19-Apr-2004 11:34


In response to Patrik:

A simpler way to print a number in binary is to use base_convert().

<? echo base_convert($bin, 10, 2); ?>

If you need it to print all 32 bits (as your function does) you can just pad it out:

<? echo str_pad(base_convert($bin, 10, 2), 32, '0', STR_PAD_LEFT); ?>

The conversion is from base 10 because when $bin is passed to base_convert(), it is converted to a string, and the default representation is in decimal.

Hope this helps.

Patrik
01-Feb-2004 09:14


I needed a little function that will print the binary as a string, here it comes.





<?php


function bin2string($bin) {


    $res = "";


    for($p=31; $p >= 0; $p--) {


      $res .= ($bin & (1 << $p)) ? "1" : "0";


    }


    return $res;


}


?>

mkr at binarywerks dot dk
29-Oct-2003 05:34


Ok, this is a better version than my previous poor example.





Running this in shell creates a progress indicator. Very useful if used when parsing large log files for instance.





#!/usr/bin/php4 -q


<?


// Displays a progress indicator


function progress($line)


{


        global $last_len;





        $del_char = pack("H" . 2, "7F");


        $line_len = strlen($line);


        $del_chars=(isset($last_len)) ? $last_len : $line_len;





        $last_len = $line_len;


        return str_repeat($del_char, ($del_chars)).$line;


}





// demo code:


for($i=0;$i<100;$i++)


{


        sleep(1);


        echo progress("i is now: $i out of 100");


}


?>

Thoth
24-Oct-2003 05:24


I thought it'll give me an "F" if i give it a "1111"...





Here's something to convert a binary-string into a hex-string and other direction too:





<?php


function hexbin($hex) {


    $bin = decbin(hexdec($hex));


    return $bin;


}





function binhex($bin) {


    $hex = dechex(bindec($bin));


    return $hex;


}


?>





simple, isn't it?

mike at symmetrytechnical dot com
28-Sep-2003 01:41


Easier hex2bin function:





<?php


function hex2bin($data)


{


    $len = strlen($data);


    return pack("H" . $len, $data);


}


?>

Francisco (ffaria at mutua dot com dot br)
21-Jul-2003 04:33


function to search a character in a normal string change this for a hexadecimal and take the especifical char code in hexa and replace this char and return the string 





<?php


function hex_replace($pCaracter,$sCaracter,$conteudo) {


    


    $pHex = bin2hex($pCaracter);


    $sHex = bin2hex($sCaracter);


        


    $tam = strlen($conteudo);    


        


    for($i = 0; $i <= $tam; $i++) {


        $cont = bin2hex(substr($conteudo,$i,1));


   


        if ($cont == $pHex) {


           $cont = $sHex;


           $hex .= $cont;


        }


    }


        


    for ($i=0;$i<strlen($hex);$i+=2)


          $bin .= chr(hexdec(substr($hex,$i,2)));


    return $bin;


}


?>





by from a litle brazilian. :-P

frederic dot surleau at atosorigin dot com
16-Jul-2003 05:25


Another version for hex2bin :





<?php


function hex2bin($hexdata){


for( $i = 0; $i < strlen( $hexdata ); $i += 2 )


eval( '$bindata .= "\x' . substr( $hexdata, $i, 2 ) . '";' );


return $bindata;}


?>

andreas.schmeiler
05-Feb-2003 06:01


<?php


function hex2bin($hexdata) {


   


   for ($i=0;$i<strlen($hexdata);$i+=2) {


      $bindata.=chr(hexdec(substr($hexdata,$i,2)));


   }


   


   return $bindata;


}


?>

admin at tsunaquack dot com
16-Jan-2003 01:04


Some gave a function to convert a hex code back into a simple text (human readable ASCII :P)



Some else gave a function that makes use of bin2hex to convert URLs into something like %12%34%56



Here is a function to go from the form %12%34%56 back into ASCII



Note that this function can easily be changed in order to transform any hex code into ASCII



<?

function _hex2text($str) {

    $str = explode('%', $str);

    array_shift($str);

    $nmlstr = '';

    foreach($str as $hexstr) {

      $nmlstr .= chr(base_convert($hexstr, 16, 10));

    }    

    return $nmlstr;

}

?>



'hope this helps :)

Regards

-Tsuna

matthew dot eastman at hotpop dot com
08-Oct-2002 10:00


This function undoes it (converts back into ASCII).





<?php


function hex2asc($myin) {


for ($i=0; $i<strlen($myin)/2; $i++) {


$myout.=chr(base_convert(substr($myin,$i*2,2),16,10));


}


return $myout;


}


?>

matt at zevi dot net
21-Aug-2002 02:27


Hopefully this helps someone...





It just displays an html representation of hex data, much like a hex viewer would.





Matt





<?php


function hexview($data){


  $bytePosition = $columnCount = $lineCount = 0;


  $columns = 8;


  $dataLength = strlen($data);


  $return = array();


  $return[] = '<table border="1" cellspacing="0" cellpadding="2">';


  for($n = 0; $n < $dataLength; $n++){


    $lines[$lineCount][$columnCount++] = substr($data, $n, 1);


    if($columnCount == $columns){


      $lineCount++;


      $columnCount = 0;


    }


  }


  foreach($lines as $line){


    $return[] = '<tr><td align="right">'.$bytePosition.': </td>';


    for($n = 0; $n < $columns; $n++){


      $return[] = '<td>'.strtoupper(bin2hex($line[$n])).'</td>';


    }


    $return[] = '<td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </td>';


    for($n = 0; $n < $columns; $n++){


      $return[] = '<td>'.(htmlentities($line[$n]) ? htmlentities($line[$n]) : '&nbsp;').'</td>';


    }


    $return[] = '</tr>';


    $bytePosition = $bytePosition + $columns;


  }


  $return[] = '</table>';


  return implode('', $return);


}


?>

php at (what spam?) at vaejas dot com
04-Aug-2002 05:01


I have found the above quoted-printable encoding function to be

extremely useful, and thank maxg for making a great function that is not already included in PHP.

(Pity it's hidden all the way over here when it could be found more easily in quoted_printable_decode() )



However, there is one missing character in the code that needs to be included:



Right after the ?Q? there needs to be an extra equal sign in order for the very first character to be translated by the e-mail software.



$string = "=?$charset?Q?=" . $encoded . "?=";

is correct.    



I don't yet have enough experience to speak for other caveats or improvements, but your mileage may vary depending on the e-mail server.



- Luke

maxg at hot dot ee
14-Dec-2001 11:47


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 "��������������� ��� ���" 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.





<?php


function hex4email ($string,$charset)


{


    $string=bin2hex ($string);


    $encoded = chunk_split($string, 2, '='); 


    $encoded=preg_replace ("/=$/","",$encoded);


    $string="=?$charset?Q?".$encoded."?=";


    


return $string;


}


?>

tightcode at hotmail dot com
25-Aug-2001 08:05


I was just browsing the above and with a little modification,


came up with the following which I believe to be more flexible:





<?php


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.

pedram at redhive dot com
31-Jan-2001 05:21


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:





<?php


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="mailto:&lt;?=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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addslashes

Last updated: Fri, 18 Jul 2008