如何在 PHP 中获得字符串的十六进制转储？

小开

最佳答案

echo bin2hex($string);

或:

for ($i = 0; $i < strlen($string); $i++) {
echo str_pad(dechex(ord($string[$i])), 2, '0', STR_PAD_LEFT);
}

$string是包含输入的变量。

小开

为了调试二进制协议，我需要一个更传统的 HEX 转储，所以我写了这个函数:

function hex_dump($data, $newline="\n")
{
static $from = '';
static $to = '';
  

static $width = 16; # number of bytes per line
  

static $pad = '.'; # padding for non-visible characters
  

if ($from==='')
{
for ($i=0; $i<=0xFF; $i++)
{
$from .= chr($i);
$to .= ($i >= 0x20 && $i <= 0x7E) ? chr($i) : $pad;
}
}
  

$hex = str_split(bin2hex($data), $width*2);
$chars = str_split(strtr($data, $from, $to), $width);
  

$offset = 0;
foreach ($hex as $i => $line)
{
echo sprintf('%6X',$offset).' : '.implode(' ', str_split($line,2)) . ' [' . $chars[$i] . ']' . $newline;
$offset += $width;
}
}

这产生了一个更传统的 HEX 转储，如下所示:

hex_dump($data);


=>


0 : 05 07 00 00 00 64 65 66 61 75 6c 74 40 00 00 00 [.....default@...]
10 : 31 42 38 43 39 44 30 34 46 34 33 36 31 33 38 33 [1B8C9D04F4361383]
20 : 46 34 36 32 32 46 33 39 32 46 44 38 43 33 42 30 [F4622F392FD8C3B0]
30 : 45 34 34 43 36 34 30 33 36 33 35 37 45 35 33 39 [E44C64036357E539]
40 : 43 43 38 44 35 31 34 42 44 36 39 39 46 30 31 34 [CC8D514BD699F014]

请注意，不可见字符被替换为句点-您可以更改每行的字节数($width)和填充字符($pad) ，以满足您的需要。我包含了一个 $newline 参数，所以如果需要在浏览器中显示输出，可以传递 "<br/>"。

小开

在调试二进制协议时，我也需要一个 hexdump ()。我决定以 PEAR 包的形式发布我的解决方案，因为它非常有用。您还可以在 github 上浏览代码。

梨: http://www.metashock.de/pear

GitHub: http://www.github.com/metashock/Hexdump

除了心灵游戏解决方案，它支持正确的最后一行渲染和额外的参数。此外，该包还包含一个名为 phphd 的 php 可执行文件，用于 cmdline 上的 hexdump。这对 Windows 系统可能有帮助:)

@ 心理战。Dk: 谢谢 strtr ()的想法。它看起来比我以前的尝试稍微快一点。整合到我的版本里。(使用减少的翻译缓冲区)。.

小开

“实用”版本:

$s = "\x04\x00\xa0\x00";
echo implode(' ', array_map(function($char) {
# return sprintf('%02s', $char);
return str_pad($char, 2, '0', STR_PAD_LEFT);
}, array_map('dechex', unpack('C*', $s))));

借用 IonuG.Stan 的评论，最后一行可能如下:

}, array_map('dechex', array_map('ord', str_split($s)))));

小开

虽然已经过去了很多年，但是为了防止其他人也在搜索这个文件，我冒昧地修改了 mind play.dk 的代码，使其接受各种选项，并模拟 BSD 命令 hexdump-C 文件的输出:

/**
* Dumps a string into a traditional hex dump for programmers,
* in a format similar to the output of the BSD command hexdump -C file.
* The default result is a string.
* Supported options:
* <pre>
*   line_sep        - line seperator char, default = "\n"
*   bytes_per_line  - default = 16
*   pad_char        - character to replace non-readble characters with, default = '.'
* </pre>
*
* @param string $string
* @param array $options
* @param string|array
*/
function hex_dump($string, array $options = null) {
if (!is_scalar($string)) {
throw new InvalidArgumentException('$string argument must be a string');
}
if (!is_array($options)) {
$options = array();
}
$line_sep       = isset($options['line_sep'])   ? $options['line_sep']          : "\n";
$bytes_per_line = @$options['bytes_per_line']   ? $options['bytes_per_line']    : 16;
$pad_char       = isset($options['pad_char'])   ? $options['pad_char']          : '.'; # padding for non-readable characters


$text_lines = str_split($string, $bytes_per_line);
$hex_lines  = str_split(bin2hex($string), $bytes_per_line * 2);


$offset = 0;
$output = array();
$bytes_per_line_div_2 = (int)($bytes_per_line / 2);
foreach ($hex_lines as $i => $hex_line) {
$text_line = $text_lines[$i];
$output []=
sprintf('%08X',$offset) . '  ' .
str_pad(
strlen($text_line) > $bytes_per_line_div_2
?
implode(' ', str_split(substr($hex_line,0,$bytes_per_line),2)) . '  ' .
implode(' ', str_split(substr($hex_line,$bytes_per_line),2))
:
implode(' ', str_split($hex_line,2))
, $bytes_per_line * 3) .
'  |' . preg_replace('/[^\x20-\x7E]/', $pad_char, $text_line) . '|';
$offset += $bytes_per_line;
}
$output []= sprintf('%08X', strlen($string));
return @$options['want_array'] ? $output : join($line_sep, $output) . $line_sep;
}

这是一个小文件的十六进制转储:

00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52  |.PNG........IHDR|
00000010  00 00 00 10 00 00 00 10  02 03 00 00 00 62 9d 17  |.............b..|
00000020  f2 00 00 00 09 50 4c 54  45 04 04 04 99 99 cc d7  |.....PLTE.......|
00000030  d7 d7 2a 66 f6 6b 00 00  00 38 49 44 41 54 78 9c  |..*f.k...8IDATx.|
00000040  63 08 05 02 06 24 22 0b  44 24 01 89 ac a4 69 4b  |c....$".D$....iK|
00000050  19 1a 16 68 70 31 74 29  75 2c 42 22 1a 16 75 00  |...hp1t)u,B"..u.|
00000060  c5 22 33 96 32 74 86 46  4c 65 58 19 1a 35 15 61  |."3.2t.FLeX..5.a|
00000070  00 00 df be 19 a6 2e 62  80 87 00 00 00 00 49 45  |.......b......IE|
00000080  4e 44 ae 42 60 82                                 |ND.B`.|
00000086

这就是法宝测试:

<?php
if (isset($argv)) {
print "Running outside of phpunit. Consider using phpunit.\n";
class PHPUnit_Framework_TestCase {}
}




class Test extends PHPUnit_Framework_TestCase
{
const FUNCTION_NAME = 'hex_dump';
const DATA_BASE64 = '
iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAgMAAABinRfyAAAACVBMVEUEBASZmczX19cqZvZrAAAA
OElEQVR4nGMIBQIGJCILRCQBiaykaUsZGhZocDF0KXUsQiIaFnUAxSIzljJ0hkZMZVgZGjUVYQAA
374Zpi5igIcAAAAASUVORK5CYII=';
private $expect = array(
'00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52  |.PNG........IHDR|',
'00000010  00 00 00 10 00 00 00 10  02 03 00 00 00 62 9d 17  |.............b..|',
'00000020  f2 00 00 00 09 50 4c 54  45 04 04 04 99 99 cc d7  |.....PLTE.......|',
'00000030  d7 d7 2a 66 f6 6b 00 00  00 38 49 44 41 54 78 9c  |..*f.k...8IDATx.|',
'00000040  63 08 05 02 06 24 22 0b  44 24 01 89 ac a4 69 4b  |c....$".D$....iK|',
'00000050  19 1a 16 68 70 31 74 29  75 2c 42 22 1a 16 75 00  |...hp1t)u,B"..u.|',
'00000060  c5 22 33 96 32 74 86 46  4c 65 58 19 1a 35 15 61  |."3.2t.FLeX..5.a|',
'00000070  00 00 df be 19 a6 2e 62  80 87 00 00 00 00 49 45  |.......b......IE|',
'00000080  4e 44 ae 42 60 82                                 |ND.B`.|',
'00000086',
);


public function testRequire() {
$file = __DIR__ . '/' . static::FUNCTION_NAME . '.php';
$this->assertFileExists($file);
include($file);
$this->assertTrue(function_exists(static::FUNCTION_NAME));
}


public function testString() {
$func = static::FUNCTION_NAME;
$data = base64_decode(static::DATA_BASE64);
if (!is_string($data)) {
throw new Exception('Unable to decode base64 encoded test data');
}
$dump = $func($data);
//var_export($dump);
$this->assertTrue(is_string($dump));
$this->assertEquals($dump, join("\n", $this->expect) . "\n");
}


}




if (isset($argv)) {
$func = Test::FUNCTION_NAME;
require_once($func . '.php');
if (count($argv) < 2) {
print "Pass arguments file, from, length.\n";
}
else {
$file = $argv[1];
if (!file_exists($file)) {
die("File not found: $file\n");
}
$from   = isset($argv[2]) && preg_match('/^\d{1,9}$/', $argv[2]) ? intval($argv[2]) : null;
$len    = isset($argv[3]) && preg_match('/^\d{1,9}$/', $argv[3]) ? intval($argv[3]) : filesize($file);
$h = fopen($file, 'r');
if ($from) {
fseek($h, $from);
}
$data = fread($h, $len);
fclose($h);
$dump = hex_dump($data);
print $dump;
//$dump = hex_dump($data, array('want_array' => true));
//print_r($dump);
}
}

小开

    echo implode(array_map(
fn ($a, $b) => sprintf("%-26s%-8s\n", $a, $b),
str_split(implode(' ', str_split(bin2hex($string), 2)), 24),
str_split($string, 8)
));