关于PHP中字符串与多进制转换函数的实例代码

/** * [字符串转换为(2,8,16进制)ASCII码] * @param string $str   [待处理字符串] * @param boolean $encode [字符串转换为ASCII|ASCII转换为字符串] * @param string $intType [2,8,16进制标示] * @return string byte_str [处理结果] * @author alexander */function strtoascii($str, $encode=true, $intType="2"){  if($encode == true){    $byte_array = str_split($str);    foreach($byte_array as &$value){      $value = ord($value);      switch ($intType) {        case 16:          $value = sprintf("%02x", $value);          break;        case 8:          $value = sprintf("%03o", $value);          break;        default:          $value = sprintf("%08b", $value);          break;      }    }    unset($value);    $byte_str = implode('', $byte_array);  }  else{    $chunk_size = $intType == 16 ? 2 : ($intType == 8 ? 3 : 8);    $byte_array = chunk_split($str, $chunk_size);    $byte_array = array_filter(explode("/r/n", $byte_array));    foreach($byte_array as &$value){      $fun_name = $intType == 16 ? 'hexdec' : ($intType == 8 ? 'octdec' : 'bindec');      $value = $fun_name($value);      $value = chr($value);    }    unset($value);    $byte_str = implode('', $byte_array);  }  return $byte_str;}