php 上传图片自动生成缩略图_PHP教程

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(); } ?>

http://www.bkjia.com/PHPjc/632970.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/632970.htmlTechArticle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 form action=uploads.php method=pos...