php 打印出字符串的16进制
下面这个函数是一个php 打印出字符串的16进制实例,这里面的核心函数就是 chr获取二进制然后再进行转成16进制数,代码如下:
- <?php
- /*
- 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]
- */
- ?>