php method to implement int to byte conversion: 1. Create a PHP sample file; 2. Define the "public static function integerToBytes($val) {...}" method; 3. Implement through mask operation Just convert int into BYTE array.
The operating environment of this tutorial: Windows 10 system, PHP version 8.1, DELL G3 computer
php How to convert int to byte ?
PHP implements the conversion of INT type, SHORT type, and STRING into BYTE array
Implements PHP to implement the conversion of INT type, SHORT type, and STRING into BYTE array:
class Bytes { public static function integerToBytes($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; } }
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.
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