十六进制和反面的编码/解码字符串 [英] Encoding/decoding string in hexadecimal and back

问题描述

给出一个可能包含任何字符(包括unicode字符)的字符串，我如何将该字符串转换为十六进制表示形式，然后反转并从十六进制获取此字符串?

Given a string that may contain any character (including a unicode characters), how can I convert this string into hexadecimal representation, and then reverse and obtain from hexadecimal this string?

推荐答案

使用pack()和unpack():

function hex2str( $hex ) {
  return pack('H*', $hex);
}

function str2hex( $str ) {
  return array_shift( unpack('H*', $str) );
}

$txt = 'This is test';
$hex = str2hex( $txt );
$str = hex2str( $hex );

echo "{$txt} => {$hex} => {$str}\n";

会产生

这是测试=> 546869732069732074657374 =>这是测试

This is test => 546869732069732074657374 => This is test

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