PHP prints out the hexadecimal value of a string_PHP tutorial

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Release: 2016-07-13 10:44:14
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The following function is a hexadecimal example of PHP printing out a string. The core function here is chr to obtain the binary and then convert it into a hexadecimal number.

The code is as follows
 代码如下 复制代码

/*
php 打印出字符串的16进制数据
*/
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;
  }
}
 
$info="this is a testx00x99hex_dump";
print_r(hex_dump($info));
/*
输出结果:
 
0 : 74 68 69 73 20 69 73 20 61 20 74 65 73 74 00 99 [this is a test..]
 
10 : 68 65 78 5f 64 75 6d 70 [hex_dump]
*/
?>


 

Copy code
/*
PHP prints out the hexadecimal data of the string
*/
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;
}
}

$info="this is a testx00x99hex_dump";
print_r(hex_dump($info));
/*
Output:

0 : 74 68 69 73 20 69 73 20 61 20 74 65 73 74 00 99 [this is a test..]

10 : 68 65 78 5f 64 75 6d 70 [hex_dump]
*/
?>


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TechArticleThe following function is a hexadecimal example of PHP printing out a string. The core function here is chr acquisition. The binary is then converted into a hexadecimal number. The code is as follows Copy the code ?...
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