php 上传图片自动生成缩略图_PHP教程-PHP-Tutorial-php.cn

php 上传图片自动生成缩略图_PHP教程

WBOY

Freigeben： 2016-07-13 10:46:07

Original

878 Leute haben es durchsucht

一款实现的生成小图功能的实现代码，有需要的朋友可以参考，每个都有详细的说明参数。

代码如下

复制代码

uploads.php文件

class image_upload{
private $srcimg;  //原图片
private $destimg;  // 目标图片
private $width;   //原图片的宽度
private $height;  //原图片的高度
private $type;   //原文件的图片类型
private $thumb_width; //缩略图的宽度
private $thumb_height; //缩略图的高度
private $cut;   //是否剪切图片到指定高度
private $tmp;   //上传图片的临时地址
private $error;
private $im;   // 创建一个临时的图片句柄
private $new_name;  //上传文件的新名字

function __construct($srcimg,$t_width,$t_height,$cut,$tmp,$error){
  $this->srcimg=$srcimg;
  $this->thumb_width=$t_width;
  $this->thumb_height=$t_height;
  $this->cut=$cut;
  $this->tmp=$tmp;
  $this->error=$error;
  $this->get_srcimg_type();
  $this->get_new_upload_name();

   }

function img_upload(){
  //文件上传的方法
  $this->check_error($this->error);
  $this->in_type();
  $dst_dir='./images';
  if(!is_dir($dst_dir)){
   mkdir($dst_dir);
   echo "%%%
";
  }

  if(is_uploaded_file($this->tmp)){
   if(move_uploaded_file($this->tmp, $this->new_name)){
    echo "文件上传成功
";
    return true;
   }else{
    echo '文件不能被移动，上传失败';
    exit;
   }
  }else{
    echo '文件上传可能被攻击';
    exit;
  }

}

function make_thumbnail(){
  //生成缩略图的方法
  $this->get_dest_imgpath();
  $this->make_im();
  $this->width=imagesx($this->im);
  $this->height=imagesy($this->im);

  $thumb_ratio=$this->thumb_width/$this->thumb_height;
  $ratio=$this->width/$this->height;


  if($this->cut==1){  //是否裁剪
    if($ratio>=$thumb_ratio){
     $img=imagecreatetruecolor($this->thumb_width, $this->thumb_height);
     imagecopyresampled($img, $this->im, 0, 0, 0, 0, $this->thumb_width, $this->thumb_height, $this->height*$thumb_ratio, $this->height);
     imagejpeg($img,$this->destimg);
     echo "缩略图生成成功";
    }else{
     $img=imagecreatetruecolor($this->thumb_width, $this->thumb_height);
     imagecopyresampled($img, $this->im, 0, 0, 0, 0, $this->thumb_width, $this->thumb_height, $this->width, $this->width/$thumb_ratio);
     imagejpeg($img,$this->destimg);
     echo "缩略图生成成功";
    }
  }else{
   if($ratio>=$thumb_ratio){
     $img=imagecreatetruecolor($this->thumb_height*$thumb_ratio, $this->thumb_height);
     imagecopyresampled($img, $this->im, 0, 0, 0, 0, $this->thumb_height*$thumb_ratio, $this->thumb_height, $this->width, $this->height);
     imagejpeg($img,$this->destimg);
     echo "缩略图生成成功";
   }else{
     $img=imagecreatetruecolor($this->thumb_width, $this->thumb_width/$thumb_ratio);
     imagecopyresampled($img, $this->im, 0, 0, 0, 0, $this->thumb_width, $this->thumb_width/$thumb_ratio, $this->width, $this->height);
     imagejpeg($img,$this->destimg);
     echo "缩略图生成成功";
   }
  }
  imagedestroy($this->im);
  imagedestroy($img);
}

private function check_error($error){
  //检查文件上传传得错误；
  if($error>0){
   switch($error){
    case 1:
     echo "上传文件的大小超过了PHP.INI文件中得配置
";
     break;
    case 2:
     echo "上传文件的大小超过了表单中的限制大小
";
     break;
    case 3:
     echo "只有部分文件被上传
";
     break;
    case 4:
     echo "没有文件被上传
";
     break;
    case 6:
     echo "php.ini中没有设置图片存放的临时未知
";
     break;
    case 7:
     echo "硬盘不可以写入，上传失败
";
     break;
    default:
     echo "未知错误";
     break;
   }
  }
}

private function get_srcimg_type(){
  //判断源文件的图片类型
  $this->type=substr(strrchr($this->srcimg, '.'),'1');
}

private function in_type(){
  //检查文件是否符合类型
  $type_arr=array('gif','jpg','png');
  if(!in_array($this->type, $type_arr)){
   echo "只支持PNG,GIF,JPG 三种类型的文件格式……，请重新上传正确的格式";
   exit;
  }
}

private function get_new_upload_name(){
  //上传的文件生成新的名字
  $this->new_name='images/'.date('YmdHis').'.'.$this->type;

}
private function make_im(){
  //从原文件新建一幅图像
  switch($this->type){
   case 'jpg':
    $this->im=imagecreatefromjpeg($this->new_name);
    break;
   case 'gif':
    $this->im=imagecreatefromgif($this->new_name);
    break;
   case 'png':
    $this->im=imagecreatefrompng($this->new_name);
    break;
   }
}
private function get_dest_imgpath(){
  //得到缩略图的存储路径
  $len1=strlen($this->new_name);
  $len2=strlen(strrchr($this->new_name,'.'));
  $len3=$len1-$len2;
  $this->destimg=substr($this->new_name,0,$len3).'_small.'.$this->type;
}

}
print_r($_FILES);
$file=$_FILES['image'];
echo $file['name'];
$uploads=new image_upload($file['name'], 120, 160, 1, $file['tmp_name'],$file['error'] );
  if($uploads->img_upload()){
   $uploads->make_thumbnail();
  }

?>