PHP字符串转二进制（支持混合字符串）

不熟悉业务，写了一个晚上

1<?php
2header("charset=utf-8;");
3
4function StrToBin($str){
5    //1.列出每个字符
6    $arr = preg_split('/(?<!^)(?!$)/u', $str);
7    //2.unpack字符
8    foreach($arr as &$v){
9        $temp = unpack('H*', $v);
10        $v = base_convert($temp[1], 16, 2);
11        unset($temp);
12    }
13
14    return join(' ',$arr);
15}
16
17function BinToStr($str){
18    $arr = explode(' ', $str);
19    foreach($arr as &$v){
20        $v = pack("H".strlen(base_convert($v, 2, 16)), base_convert($v, 2, 16));
21    }
22
23    return join('', $arr);
24}
25
26echo StrToBin("哈哈hhh123");
27echo '<br/>';
28echo BinToStr(StrToBin("哈哈hhh123"));