How to convert php to binary

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.

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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");

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

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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 = '这边是二进制数字';
$hex = bin2hex($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
$bin_str = pack('H' . strlen($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;);

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