How to convert php to binary

藏色散人
Release: 2023-03-05 13:54:01
Original
4704 people have browsed it

How to convert php to binary: first create a PHP sample file; then define a StrToBin method; then parse the string through the unpack method; and finally convert to binary through the "base_convert" function.

How to convert php to binary

Recommended: "PHP Video Tutorial"

PHP String to Binary Conversion

I found a method for converting string to binary on the Internet (the relevant problem description and problems are in the following code, please read it patiently, thank you):

/** 
* 将字符串转换成二进制 
* @param type $str 
* @return type 
* php 中显示的字符串是多少进制的??
* 例如:$str = '你好'; // 这边的 '你好' 是什么进制数据(我知道他是字符串!)??
*/  
function StrToBin($str){  
    //1.列出每个字符
    // 这边的分割正则也不理解
    // (?<!^) 后瞻消极断言
    // (?!$) 前瞻消极断言
    // 看意思好像说的是:不以^开头(但是这边 ^ 又没有被转义...),不以 $ 结尾(同上)
    // 然后得到的记过就是字符串一个个被分割成了数组(郁闷)
    // 求解释
    $arr = preg_split(&#39;/(?<!^)(?!$)/u&#39;, $str);  
    //2.unpack字符  
    foreach($arr as &$v){
        /**
         * unpack:将二进制字符串解包(英语原文:Unpack data from binary string)
         * H: 英语描述原文:Hex string, high nibble first 
         * 这段代码做了什么??
         */
        $temp = unpack(&#39;H*&#39;, $v); // 这边被解析出来的字符串为什么是 16进制的??
        $v = base_convert($temp[1], 16, 2);  
        unset($temp);  
    }  
  
    return join(&#39; &#39;,$arr);  
}  
  
/** 
* 讲二进制转换成字符串 
* @param type $str 
* @return type 
*/  
function BinToStr($str){  
    $arr = explode(&#39; &#39;, $str);  
    foreach($arr as &$v){  
        // 他做了什么??
        $v = pack("H".strlen(base_convert($v, 2, 16)), base_convert($v, 2, 16));  
    }  
  
    return join(&#39;&#39;, $arr);  
}  
  
echo StrToBin("php二次开发:www.php2.cc");;  
echo &#39;<br/>&#39;;  
echo BinToStr("1110000 1101000 1110000 111001001011101010001100 111001101010110010100001 111001011011110010000000 111001011000111110010001 111011111011110010011010 1110111 1110111 1110111 101110 1110000 1101000 1110000 110010 101110 1100011 1100011");
Copy after login

How do the above functions realize conversion between binary and string? ?

-------Separator-------

I already know about pack and unpack! By the way, let me share:

Let’s use this example to talk about what I understand:

pack usage:

// 二进制数字 => 二进制字符串
$bin_number = &#39;这边是二进制数字&#39;;
$hex = bin2hex($bin_number );
// 由于指定了 H(16进制,高位在前),所以第二个参数需要使 16 进制字字符串
// strlen($hex) 指定打包多少个 16 进制字符串
// 也可以使用 * 来自动识别
// 结果就是:二进制字符串了
$bin_str = pack(&#39;H&#39; . strlen($hex) , $hex);
<=>
$dec = bindec($bin_number);
$hex = dechex($dec);
$bin_str = hex2bin($hex);
unpack 用法:
//  转换作用:2进制字符串 => 16进制字符串
$str = unpack(&#39;H*&#39; , &#39;陈&#39;); 
<=>
$str = bin2hex(&#39;陈&#39;);
Copy after login

The above is the detailed content of How to convert php to binary. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
php
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!