PHP 圖片上傳類別並產生縮圖

/**
* 上傳圖片
*/
class imgUpload{
 static protected $a;
 protected $formName; //表單名稱
 protected $directory; //檔案上傳至目錄
 protected $maxSize; //最大檔案上傳大小
 protected $canUpload; //是否可以上傳
 protected $doUpFile; //上傳的檔案名稱
 protected $sm_File; //縮圖名稱

 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 = '';
 }

 //判斷圖片是否屬於允許格式內
 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;
 }

 //取得檔案大小
 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;
 }
 }
 }

 }
 }
 }

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

 //取得檔案名稱
 public function getName(){
 if ($this->canUpload) {
 return $_FILES[$this->formName]['name'];
 }
 }

 //新檔案名稱
 public function newName(){
 return date('YmdHis').rand(0,9);
 }

 //上傳檔案
 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;
 }
 }
 }

 //建立小心
 public functionthumb($_dstChar=' _m', $max_len=m', $max_len= 320){ //$_dstChar:_m , _s
 if ($this->canUpload && $this->doUpFile != "") {
 $_ext = $this- >getExt();
 $_srcImage = $this->directory.$this->doUpFile.".".$_ext;

 //取得圖片資訊流量
 $_date = getimagesize($_srcImage, &$info);

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

 //寬高依縮放比例，寬度不大於$_max_len
 if ($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;
 }
 {
 $dst_h = $_max_len;
 $dst_w = $percent * $dst_h;
 }
 }
 else
 {
 $dst_w = $srcww; $dst_h = $src_h;
 }

 //建立了幾個時間、來源圖片的位置
 $src_x = '';
 $src_y = '';

 //判斷如果要用於logo，則對其進行裁減
 if ('s_' == $_dstChar) {
 $src_x = $src_w * 0.10;
 $src_y = $src_h * 0.10;
 $src_w *= 0.8;
 $src_h *= 0.8;
 }

 //判斷圖片類型並建立對應新圖片
 switch ($_date[2 ] ){
 情況1:
 $src_im = imagecreatefromgif($_srcImage);
 中斷;
 情況2:
 $src_im = imagecreatefromjpeg($srcImage); > 案例3:
 $src_im = imagecreatefrompng($_srcImage);
 中斷;
 案例8:
 $src_im = imagecreatefromwbmp($_srcImage);
 //建立一張新圖片
 if ($_date[2]==1) { //gif 無法套用imagecreatetruecolor
 $dst_im = imagecreate($dst_w, $dst_h);
 }else {
 $dst_im = imagecreatetruecolor($dst_w, $dst_h);
 }

 //對這副圖像進行縮圖copy
// $bg = imagecolorallocate($dst_im,255,255,0);
 imagecopyresized($dst_im,$src_im,$src0, $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);
  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，所以在這裡用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);
 }

 //得到上傳後的檔名
 public function getUpFile(){
 if ($this->doUpFile!='') {
 $_ext = $this->getExt();
 return $this->doUpFile .".".$_ext;
 }else {
 return false;
 }
 }

 //得到上傳後的檔案全路徑
 public function getFilePatch( ){
 if ($this->doUpFile!='') {
 $_ext = $this->getExt();
 return $this->directory.$this->doUpFile.". ".$_ext;
 }else {
 return false;
 }
 }

 //得到縮圖檔案全路徑
 public function getThumb(){
 if ($this->sm_File!='') {
 return $this->sm_File;
 }else {
 return false;
 }
 }
 //得到上傳檔案的路徑
 public function getDirectory(){
 if ($this->directory!='') {
 return $this->directory;
 }else {
 return false ;
 }
 }
}
?>

圖片上傳, PHP