PHP 圖片上傳類并生成縮略圖

<?PHP
/**


上傳圖片
*/
class imgUpload{

  static protected $a;
  protected $formName;        //表單名稱
  protected $directory;        //文件上傳至目錄
  protected $maxSize;                //最大文件上傳大小
  protected $canUpload;        //是否可以上傳
  protected $doUpFile;        //上傳的文件名
  protected $sm_File;                //縮略圖名稱

  private function __construct($_formName='file', $_directory='./images/uploads/', $_maxSize=1048576){                        //1024*1024=1M
          //初始化參數
          $this->formName = $_formName;
          $this->directory = $_directory;
          $this->maxSize = $_maxSize;
          $this->canUpload = true;
          $this->doUpFile = '';
          $this->sm_File = '';
  }

  //判斷圖片是否屬于允許格式內
  static public function Type($_formName='file'){
          $_type = $_FILES[$_formName]['type'];
          switch ($_type){
                  case 'image/gif':
                          if (self::$a==NULL)
                                  self::$a = new imgUpload($_formName);
                          break;
                  case 'image/pjpeg':
                          if (self::$a==NULL)
                                  self::$a = new imgUpload($_formName);
                          break;
                  case 'image/x-png':
                          if (self::$a==NULL)
                                  self::$a = new imgUpload($_formName);
                          break;
                  default:
                          self::$a = false;
          }
          return self::$a;
  }

  //獲取文件大小
  public function getSize($_format='K'){
          if ($this->canUpload) {
                  if (0 == $_FILES[$this->formName]['size']) {
                          $this->canUpload = false;
                          return $this->canUpload;
                          break;
                  }
                  switch ($_format){
                          case 'B':
                                  return $_FILES[$this->formName]['size'];
                                  break;
                          case 'K':
                                  return round($_FILES[$this->formName]['size'] / 1024);
                                  break;
                          case 'M':
                                  return round($_FILES[$this->formName]['size'] / (1024*1024),2);
                                  break;
                  }
          }       
  }

  //獲取文件類型
  public function getExt(){
          if ($this->canUpload) {
                  $_name = $_FILES[$this->formName]['name'];
                  $_nameArr = explode('.',$_name);
                  $_count = count($_nameArr)-1;
          }
          return $_nameArr[$_count];
  }

  //獲取文件名稱
  public function getName(){
          if ($this->canUpload) {
                  return $_FILES[$this->formName]['name'];
          }
  }

  //新建文件名
  public function newName(){
          return date('YmdHis').rand(0,9);
  }

  //上傳文件
  public function upload(){
          if ($this->canUpload)
          {
                  $_getSize = $this->getSize('B');
                  if (!$_getSize)
                  {
                          return $_getSize;
                          break;
                  }
                  else
                  {
                          $_newName = $this->newName();
                          $_ext = $this->getExt();
                          $_doUpload = move_uploaded_file($_FILES[$this->formName]['tmp_name'], $this->directory.$_newName.".".$_ext);
                          if ($_doUpload)
                          {
                                  $this->doUpFile = $_newName;
                          }
                          return $_doUpload;
                  }
          }
  }

  //創建縮略圖
  public function thumb($_dstChar='_m', $_max_len=320){                //$_dstChar:_m , _s
          if ($this->canUpload && $this->doUpFile != "") {
                  $_ext = $this->getExt();
                  $_srcImage = $this->directory.$this->doUpFile.".".$_ext;

                  //得到圖片信息數組
                  $_date = getimagesize($_srcImage, &$info);

                  $src_w = $_date[0];        //源圖片寬
                  $src_h = $_date[1];        //源圖片高
                  $src_max_len = max($src_w, $src_h);                //求得長邊
                  $src_min_len = min($src_w, $src_h);                //求得短邊
                  $dst_w = '';                //目標圖片寬
                  $dst_h = '';                //目標圖片高

                  //寬高按比例縮放，最長邊不大于$_max_len
                  if ($src_max_len>$_max_len)
                  {
                          $percent = $src_min_len / $src_max_len;
                          if ($src_w == $src_max_len)
                          {
                                  $dst_w = $_max_len;
                                  $dst_h = $percent * $dst_w;
                          }
                          else
                          {
                                  $dst_h = $_max_len;
                                  $dst_w = $percent * $dst_h;
                          }
                  }
                  else
                  {
                          $dst_w = $src_w;
                          $dst_h = $src_h;
                  }

                  //建立縮略圖時,源圖片的位置
                  $src_x = '';
                  $src_y = '';

                  //判斷如果縮略圖用于logo，將對其進行裁減
                  if ('s_' == $_dstChar) {
                          $src_x = $src_w * 0.10;
                          $src_y = $src_h * 0.10;
                          $src_w *= 0.8;
                          $src_h *= 0.8;
                  }

                  //判斷圖片類型并創建對應新圖片
                  switch ($_date[2]){
                          case 1:
                                  $src_im = imagecreatefromgif($_srcImage);
                                  break;
                          case 2:
                                  $src_im = imagecreatefromjpeg($_srcImage);
                                  break;
                          case 3:
                                  $src_im = imagecreatefrompng($_srcImage);
                                  break;
                          case 8:
                                  $src_im = imagecreatefromwbmp($_srcImage);
                                  break;
                  }

                  //創建一幅新圖像
                  if ($_date[2]==1) {                //gif無法應用imagecreatetruecolor
                          $dst_im = imagecreate($dst_w, $dst_h);
                  }else {
                          $dst_im = imagecreatetruecolor($dst_w, $dst_h);
                  }

                  //對這副圖像進行縮略圖copy

//                        $bg = imagecolorallocate($dst_im,255,255,0);

                  imagecopyresized($dst_im,$src_im, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
                  //對圖片進行抗鋸齒操作
                  imageantialias($dst_im, true);

                  switch ($_date[2]) {
                          case 1:
                                  $cr = imagegif($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
                                  break;
                          case 2:
                                  $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
                                  break;
                          case 3://imagepng有問題，所以在這里用imagejpg代替
                                  $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
                                  break;
                  }

//                        $cr = imagejpeg($dst_im, $this->directory.$_dstChar.$this->doUpFile, 90);

                  if ($cr) {
                          $this->sm_File = $this->directory.$this->doUpFile.$_dstChar.".".$_ext;

                          return $this->sm_File;
                  }else {
                          return false;
                  }
          }
          imagedestroy($dst_im);
          imagedestroy($cr);
  }

  //得到上傳后的文件名
  public function getUpFile(){
          if ($this->doUpFile!='') {
                  $_ext = $this->getExt();
                  return $this->doUpFile.".".$_ext;
          }else {
                  return false;
          }
  }

  //得到上傳后的文件全路徑
  public function getFilePatch(){
          if ($this->doUpFile!='') {
                  $_ext = $this->getExt();
                  return $this->directory.$this->doUpFile.".".$_ext;
          }else {
                  return false;
          }
  }

  //得到縮略圖文件全路徑
  public function getThumb(){
          if ($this->sm_File!='') {
                  return $this->sm_File;
          }else {
                  return false;
          }
  }
  //得到上傳文件的路徑
  public function getDirectory(){
          if ($this->directory!='') {
                  return $this->directory;
          }else {
                  return false;
          }
  }

}
?></pre>