bin2hex

(PHP 4, PHP 5, PHP 7, PHP 8)

bin2hex将二进制数据转换为十六进制表示

说明

bin2hex(string $string): string

返回 ASCII 字符串,包含 string 的十六进制表示。转换是高位优先,按字节完成的。

参数

string

字符串。

返回值

返回指定字符串的十六进制表示。

范例

示例 #1 bin2hex() 示例

<?php

$hex
= bin2hex('Hello world!');

var_dump($hex);
var_dump(hex2bin($hex));
?>

以上例程会输出:

string(24) "48656c6c6f20776f726c6421"
string(12) "Hello world!"

参见

  • hex2bin() - 转换十六进制字符串为二进制字符串
  • pack() - 将数据打包成二进制字符串

add a note

User Contributed Notes 7 notes

up
53
tehjosh at gamingg dot net
15 years ago
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.
up
11
j_lozinskit at yahoo dot co dot uk
18 years ago
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
up
2
busuioc dot alexandru at gmail dot com
3 years ago
Convenient way of generating API keys

<?php
$apikey
= bin2hex(random_bytes(32)); // generates 64 characters long string /^[0-9a-f]{64}$/
?>
up
2
tightcode at hotmail dot com
21 years ago
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.
up
4
pedram at redhive dot com
21 years ago
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
up
0
cb at dialogs dot com
16 hours ago
Be aware that, although it says "binary" data, it really assumes a string. So bin2hex(0) returns the same as bin2hex("0") which is "30". Even casting it to an (int) still returns "30"
up
-1
subdivizion at gmail dot com
13 years ago
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;
    }
}
?>
To Top