PHP implements hexadecimal conversion (binary, octal, hexadecimal) and mutual conversion code

The example in this article describes how PHP implements the method of receiving a binary stream and converting it into a picture. Share it with everyone for your reference, the details are as follows:

Here, php is implemented to receive the binary stream and convert it into an image. The image class imageUpload.php used is as follows:

<?php
/**
 * 图片类
* @version 1.0
*
* PHP默认只识别application/x-www.form-urlencoded标准的数据类型。
* 因此，对型如text/xml 或者 soap 或者 application/octet-stream 之类的内容无法解析，如果用$_POST数组来接收就会失败！
* 故保留原型，交给$GLOBALS[&#39;HTTP_RAW_POST_DATA&#39;] 来接收。
* 另外还有一项 php://input 也可以实现此这个功能
* php://input 允许读取 POST 的原始数据。和 $HTTP_RAW_POST_DATA 比起来，它给内存带来的压力较小，并且不需要任何特殊的 php.ini 设置。php://input和 $HTTP_RAW_POST_DATA 不能用于 enctype="multipart/form-data"。
*/
class imageUpload {
  const ROOT_PATH = &#39;./&#39;;
  const FAIL_WRITE_DATA = &#39;Fail to write data&#39;;
  //没有数据流
  const NO_STREAM_DATA = &#39;The post data is empty&#39;;
  //图片类型不正确
  const NOT_CORRECT_TYPE = &#39;Not a correct image type&#39;;
  //不能创建文件
  const CAN_NOT_CREATE_FILE = &#39;Can not create file&#39;;
  //上传图片名称
  public $image_name;
  //图片保存名称
  public $save_name;
  //图片保存路径
  public $save_dir;
  //目录+图片完整路径
  public $save_fullpath;
  /**
   * 构造函数
   * @param String $save_name 保存图片名称
   * @param String $save_dir 保存路径名称
   */
  public function __construct($save_name, $save_dir) {
    //set_error_handler ( $this->error_handler () );
    //设置保存图片名称，若未设置，则随机产生一个唯一文件名
    $this->save_name = $save_name ? $save_name : md5 ( mt_rand (), uniqid () );
    //设置保存图片路径，若未设置，则使用年/月/日格式进行目录存储
    $this->save_dir = $save_dir ? self::ROOT_PATH .$save_dir : self::ROOT_PATH .date ( &#39;Y/m/d&#39; );
    //创建文件夹
    @$this->create_dir ( $this->save_dir );
    //设置目录+图片完整路径
    $this->save_fullpath = $this->save_dir . &#39;/&#39; . $this->save_name;
  }
  //兼容PHP4
  public function image($save_name) {
    $this->__construct ( $save_name );
  }
  public function stream2Image() {
    //二进制数据流
    $data = file_get_contents ( &#39;php://input&#39; ) ? file_get_contents ( &#39;php://input&#39; ) : gzuncompress ( $GLOBALS [&#39;HTTP_RAW_POST_DATA&#39;] );
    //数据流不为空，则进行保存操作
    if (! empty ( $data )) {
      //创建并写入数据流，然后保存文件
      if (@$fp = fopen ( $this->save_fullpath, &#39;w+&#39; )) {
        fwrite ( $fp, $data );
        fclose ( $fp );
        $baseurl = "http://" . $_SERVER ["SERVER_NAME"] . ":" . $_SERVER ["SERVER_PORT"] . dirname ( $_SERVER ["SCRIPT_NAME"] ) . &#39;/&#39; . $this->save_name;
        if ( $this->getimageInfo ( $baseurl )) {
          echo $baseurl;
        } else {
          echo ( self::NOT_CORRECT_TYPE );
        }
      } else {
      }
    } else {
      //没有接收到数据流
      echo ( self::NO_STREAM_DATA );
    }
  }
  /**
   * 创建文件夹
   * @param String $dirName 文件夹路径名
   */
  public function create_dir($dirName, $recursive = 1,$mode=0777) {
    ! is_dir ( $dirName ) && mkdir ( $dirName,$mode,$recursive );
  }
  /**
   * 获取图片信息，返回图片的宽、高、类型、大小、图片mine类型
   * @param String $imageName 图片名称
   */
  public function getimageInfo($imageName = &#39;&#39;) {
    $imageInfo = getimagesize ( $imageName );
    if ($imageInfo !== false) {
      $imageType = strtolower ( substr ( image_type_to_extension ( $imageInfo [2] ), 1 ) );
      $imageSize = filesize ( $imageInfo );
      return $info = array (&#39;width&#39; => $imageInfo [0], &#39;height&#39; => $imageInfo [1], &#39;type&#39; => $imageType, &#39;size&#39; => $imageSize, &#39;mine&#39; => $imageInfo [&#39;mine&#39;] );
    } else {
      //不是合法的图片
      return false;
    }
  }
  /*private function error_handler($a, $b) {
   echo $a, $b;
  }*/
}
?>

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