How to convert characters to binary in php

php method to convert characters to binary: 1. Create a PHP sample file; 2. Convert the string to binary data through the "function StrToBin($str){...}" method.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to convert characters to binary in php?

binary means binary.

php converts strings into binary data strings

Code such as:

/**
    * 将字符串转换成二进制
    * @param type $str
    * @return type
    */
    function StrToBin($str){
        //1.列出每个字符
        $arr = preg_split(&#39;/(?<!^)(?!$)/u&#39;, $str);
        //2.unpack字符
        foreach($arr as &$v){
            $temp = unpack(&#39;H*&#39;, $v);
            $v = base_convert($temp[1], 16, 2);
            unset($temp);
        }
        return join(&#39; &#39;,$arr);
    }
    /**
    * 将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){
            $v = pack("H".strlen(base_convert($v, 2, 16)), base_convert($v, 2, 16));
        }
        return join(&#39;&#39;, $arr);
    }

Related introduction:

preg_split function separates strings through a regular expression .

Syntax

array preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

Separate the given string by a regular expression.

base_convert() function converts numbers between arbitrary bases.

Syntax

base_convert(number,frombase,tobase);

unpack() function unpacks data from a binary string.

Grammar

unpack(format,data)

Recommended study: "PHP Video Tutorial"

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