PHP实现INT型,SHORT型,STRING转换成BYTE数组

实现PHP实现INT型,SHORT型,STRING转换成BYTE数组的转化:

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;
  }
}
posted @ 2014-02-26 10:23  豆腐居士  阅读(2195)  评论(0编辑  收藏  举报