PHP prints out the hexadecimal value of a string_PHP tutorial

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

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/* 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] */ ?>

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/*
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 ?...