(PHP 4, PHP 5, PHP 7, PHP 8)
bin2hex — Convertit des données binaires en représentation hexadécimale
Retourne la chaîne string dont tous les caractères
sont représentés par leur équivalent hexadécimal. La chaîne retournée
est une chaîne ASCII. La conversion supporte les caractères binaires,
et utilise les bits de poids forts en premier.
Retourne la représentation hexadécimale de la chaîne fournie.
Exemple #1 Exemple avec bin2hex()
<?php
$hex = bin2hex('Hello world!');
var_dump($hex);
var_dump(hex2bin($hex));
?>L'exemple ci-dessus va afficher :
string(24) "48656c6c6f20776f726c6421" string(12) "Hello world!"
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.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\xFFIn 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 $encoded;
}
?>
so for example:
<a href="mailto:<?=hex_encode("pedram@redhive.com")?>">email me</a>
would produce the following address:
%70%65%64%72%61%6d%40%72%65%64%68%69%76%65%2e%63%6f%6d
-pedramI was just browsing the above and with a little modification,
came up with the following which I believe to be more flexible:
<?php
function bin2hex($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.Here's a function to check if a string contains any 7-bit GSM characters.
It might come useful for people working on SMS platforms.
<?php
function check_gsm($str)
{
$arr = array(
"0x00", "0x01", "0x02", "0x03", "0x04", "0x05","0x06","0x07","0x08","0x09",
"0x0A","0x0B","0x0C","0x0D","0x0E","0x0F","0x10","0x11","0x12","0x13",
"0x14","0x15","0x16","0x17","0x18","0x19","0x1A","0x1B","0x1B0A",
"0x1B14","0x1B28","0x1B29","0x1B2F","0x1B3C","0x1B3D","0x1B3E",
"0x1B40","0x1B65","0x1C","0x1D","0x1E","0x1F","0x20","0x21","0x22",
"0x23","0x24","0x25","0x26","0x27","0x28","0x29","0x2A","0x2B","0x2C",
"0x2D","0x2E","0x2F","0x30","0x31","0x32","0x33","0x34","0x35","0x36",
"0x37","0x38","0x39","0x3A","0x3B","0x3C","0x3D","0x3E","0x3F","0x40",
"0x41","0x42","0x43","0x44","0x45","0x46","0x47","0x48","0x49","0x4A",
"0x4B","0x4C","0x4D","0x4E","0x4F","0x50","0x51","0x52","0x53","0x54",
"0x55","0x56","0x57","0x58","0x59","0x5A","0x5B","0x5C","0x5D","0x5E",
"0x5F","0x60","0x61","0x62","0x63","0x64","0x65","0x66","0x67","0x68",
"0x69","0x6A","0x6B","0x6C","0x6D","0x6E","0x6F","0x70","0x71","0x72",
"0x73","0x74","0x75","0x76","0x77","0x78","0x79","0x7A","0x7B","0x7C",
"0x7D","0x7E","0x7F");
$strl = strlen($str);
for ($i = 0;$i < $strl; $i++)
{
$char = '0x' . bin2hex(substr($str,$i,1));
$pos = in_array($char,$arr);
if ($pos == 1)
{
$j++;
}
}
if ($j < $strl)
{
return false;
}
else
{
return true;
}
}
?>Convenient way of generating API keys
<?php
$apikey = bin2hex(random_bytes(32)); // generates 64 characters long string /^[0-9a-f]{64}$/
?>