PHP之图片上传类实例代码(加了缩略图)

<form action="<?php $_server['php_self']; ?>" enctype="multipart/form-data" method="post" ><input type="text" name="name" /><input type="file" name="file" /><input type="submit" name='submit' value="提交" ></form> 
 
<?php 
/** 
 * created by phpstorm. 
 * user: administrator 
 * date: 2016/6/28 
 * time: 21:04 
 */
 
class upload{ 
   protected $filemine;//文件上传类型 
   protected $filepath;//文件上传路径 
   protected $filemax;//文件上传大小 
   protected $fileext;//文件上传格式 
   protected $filename;//文件名 
   protected $fileerror;//文件出错设置 
   protected $fileflag;//文件检测 
   protected $fileinfo; //files 
   protected $ext; //文件扩展 
   protected $path; 
 
  //文件上传 
  public function __construct($filename="file",$filemax=20000000,$filepath="./uploads",$fileflag=true,$fileext=array('jpg','exe'),$filemine=array('image/jpeg')) 
  { 
    $this->filename=$filename; 
    $this->fileinfo=$_files[$this->filename]; 
    $this->filemax=$filemax; 
    $this->filepath=$filepath; 
    $this->fileflag=$fileflag; 
    $this->fileext=$fileext; 
    $this->filemine=$filemine; 
 
    //var_dump($this->filename); 
 
  } 
 
  //错误判断 
  public function uperror(){ 
 
      if($this->fileinfo['error']>0){ 
        switch($this->fileinfo['error']) 
        { 
          case 1: 
          $this->fileerror="上传文件大小超过服务器允许上传的最大值，php.ini中设置upload_max_filesize选项限制的值 "; 
            break; 
          case 2: 
            $this->fileerror="上传文件大小超过html表单中隐藏域max_file_size选项指定的值"; 
            break; 
          case 3: 
            $this->fileerror="文件部分被上传"; 
            break; 
          case 4: 
            $this->fileerror="没有选择上传文件"; 
            break; 
          case 5: 
            $this->fileerror="未找到临时目录"; 
            break; 
          case 6: 
            $this->fileerror="文件写入失败"; 
            break; 
          case 7: 
            $this->fileerror="php文件上传扩展没有打开 "; 
            break; 
          case 8: 
            $this->fileerror=""; 
            break; 
 
        } 
        return false; 
      } 
      return true; 
 
  } 
 
  //检测文件类型 
  public function upmine(){ 
    if(!in_array($this->fileinfo['type'],$this->filemine)) { 
      $this->error="文件上传类型不对"; 
      return false; 
    } 
    return true; 
 
  } 
  //检测文件格式 
  public function upext(){ 
    $this->ext=pathinfo($this->fileinfo['name'],pathinfo_extension); 
    //var_dump($ext); 
    if(!in_array($this->ext,$this->fileext)){ 
      $this->fileerror="文件格式不对"; 
      return false; 
    } 
    return true; 
  } 
  //检测文件路径 
  public function uppath(){ 
    if(!file_exists($this->filepath)){ 
      mkdir($this->filepath,0777,true); 
    } 
  } 
  //检测文件大小 
  public function upsize(){ 
    $max=$this->fileinfo['size']; 
    if($max>$this->filemax){ 
      $this->fileerror="文件过大"; 
      return false; 
    } 
    return true; 
  } 
  //检测文件是否http 
  public function uppost(){ 
    if(!is_uploaded_file($this->fileinfo['tmp_name'])){ 
      $this->fileerror="恶意上偿还"; 
      return false; 
    } 
    return true; 
  } 
  //文件名防止重复 
  public function upname(){ 
    return md5(uniqid(microtime(true),true)); 
  } 
 
  //图片缩略图 
  public function smallimg($x=100,$y=100){ 
    $imgatt=getimagesize($this->path); 
    //图像宽，高，类型 
    $imgwidth=$imgatt[0]; 
    $imgheight=$imgatt[1]; 
    $imgext=$imgatt[2]; 
    //等比列缩放 
 
    if(($x/$imgwidth)>($y/$imgheight)){ 
      $bl=$y/$imgheight; 
    }else{ 
      $bl=$x/$imgwidth; 
    } 
    $x=floor($imgwidth*$bl); //缩放后 
    $y=floor($imgheight*$bl); 
    $images=imagecreatetruecolor($x,$y); 
    $big=imagecreatefromjpeg($this->path); 
    imagecopyresized($images,$big,0,0,0,0,$x,$y,$imgwidth,$imgwidth); 
    switch($imgext){ 
      case 1: 
        $imageout=imagecreatefromgif($this->path); 
        break; 
      case 2: 
        $imageout=imagecreatefromjpeg($this->path); 
        break; 
      case 3: 
        $imageout=imagecreatefromgif($this->path); 
        break; 
    } 
    $im=imagejpeg($images,$this->path); 
 
 
 
 
  } 
 
  //文件双传 
  public function uploads() 
  { 
    if($this->uperror()&&$this->upmine()&&$this->upext()&&$this->upsize()&&$this->uppost()){ 
      $this->uppath(); 
      $names=$this->upname(); 
      $this->path=$this->filepath.'/'. $names.'.'.$this->ext; 
 
      if(move_uploaded_file($this->fileinfo['tmp_name'], $this->path)){ 
        return $this->path; 
      }else{ 
        $this->fileerror="上传失败"; 
      } 
    }else{ 
      exit("<b>".$this->fileerror."</b>"); 
    } 
  } 
 
 
} 
 
 
?>

<?php 
  header("content-type:imagejpeg"); 
header("content-type:text/html;charset=utf-8"); 
 require 'list.php'; 
 $u=new upload(); 
 $a=$u->uploads(); 
 
 $c=$u->smallimg(); 
echo "<img src={$a} />"; 
echo "<img src={$c} />"; 
 
?> 

<!doctype html> 
<html> 
<head> 
<meta charset="utf-8"> 
<meta http-equiv="x-ua-compatible" content="ie=edge,chrome=1"> 
<title>examples</title> 
<meta name="description" content=""> 
<meta name="keywords" content=""> 
<link href="" rel="stylesheet"> 
</head> 
<body> 
  <form action="ce.php" enctype="multipart/form-data" method="post" > 
  <input type="text" name="name" /><input type="file" name="file" /> 
  <input type="submit" name='submit' value="提交" > 
  </form> 
</body> 
</html>