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How to convert int to byte in php

藏色散人
Release: 2023-03-17 19:24:01
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php method to implement int to byte conversion: 1. Create a PHP sample file; 2. Define the "public static function integerToBytes($val) {...}" method; 3. Implement through mask operation Just convert int into BYTE array.

How to convert int to byte in php

The operating environment of this tutorial: Windows 10 system, PHP version 8.1, DELL G3 computer

php How to convert int to byte ?

PHP implements the conversion of INT type, SHORT type, and STRING into BYTE array

Implements PHP to implement the conversion of INT type, SHORT type, and STRING into BYTE array:

class Bytes {
  public static function integerToBytes($val) {
    $val = (int)$val;
    $byte = array();
    //低位在前,即小端法表示
    $byte[0] = ($val & 0xFF);//掩码运算
    $byte[1] = ($val >> 8 & 0xFF);
    $byte[2] = ($val >> 16 & 0xFF);
    $byte[3] = ($val >> 24 & 0xff);
    return $byte;
  }
 
  public static function bytesToInteger(array $bytes, $pos) {
    $val = 0;
    $val = $bytes[$pos + 3] & 0xff;
    $val <<= 8;
    $val |= $bytes[$pos + 2] & 0xff;
    $val <<= 8;
    $val |= $bytes[$pos + 1] & 0xff;
    $val <<= 8;
    $val |= $bytes[$pos + 0] & 0xff;
    return intval($val);
  }
 
  public static function shortToBytes($val) {
    $val = intval($val);
    $byt = array();
    $byt[0] = ($val & 0xff);
    $byt[1] = ($val >> 8 & 0xff);
    return $byt;
  }
 
  public static function bytesToShort($bytes) {
    $val = 0;
    $val = $bytes[1] & 0xff;
    $val <<= 8;
    $val |= $bytes[0] & 0xff;
    return $val;
  }
 
  public static function String2AsciiArray($str) {
    $str = (string) $str;
    $strLength = strlen($str);
    $rtn = array();
    for($i = 0; $i < $strLength; $i++) {
      $rtn[]= ord($str[$i]);
    }
    return $rtn;
  }
}
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Related introduction: A mask is a string of binary codes that performs a bitwise AND operation on the target field to mask the current input bit.

Recommended learning: "PHP Video Tutorial"

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