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。
<?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]
*/
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