PHP图片上传类(多文件上传、缩略图、水印)

发布时间:2019-12-26编辑:脚本学堂
分享一个php图片上传类,可以实现多文件的上传、缩略图、为图片加水印等功能,感兴趣的朋友参考学习下。

本节内容:
PHP实现图片上传的类

为大家分享一例php 图片上传的代码,一个完整的php 图片上传类。

1,html页面部分
 

复制代码 代码示例:
<?php
 /*
  本类支持文件上传,图片生成略缩图,加水印,按日期生成目录的基本功能
 调用例子:
 控制器代码:
 */
 
 // 图片上传 Demo
 
 if ($_GET['action'] == 'save') {
     $up = new upload();  //创建 
     $up->set_dir(dirname(__FILE__).'/upload/','{y}/{m}');   //保存路径,支持{y}{m}{d}这几个选项   
     $up->set_thumb(100,80); //缩略图大小设置.单位为像素
     $up->set_watermark(dirname(__FILE__).'/jblog/images/watermark.png',6,90);       //水印设置
     $fs = $up->execute(); //开始执行  
 
     var_dump($fs); //测试用 查看类的情况
//   print_r($fs);
 }   
 ?>
 
 <html>      
     <head><title>test</title></head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
     <body style="margin:0;padding:0">      
     <form name="upload" method="post" action="?action=save" enctype="multipart/form-data" style="margin:0">
        <!-- //支持多张图片上传 -->
         <input type="file" name="attach[]" />      
         <input type="file" name="attach[]" />
        <!-- //支持多张图片上传 -->
         <input type="submit" name="submit" value="上 传" />      
     </form>      
     </body>      
 </html>

2,php图片上传
 

复制代码 代码示例:
<?php
//  图片上传类
 class upload {       
     var $dir;            //附件存放物理目录      
     var $time;           //自定义文件上传时间      
     var $allow_types;    //允许上传附件类型      
     var $field;          //上传控件名称      
     var $maxsize;        //最大允许文件大小,单位为KB      
       
     var $thumb_width;    //缩略图宽度      
     var $thumb_height;   //缩略图高度      
       
     var $watermark_file; //水印图片地址      
     var $watermark_pos;  //水印位置      
     var $watermark_trans;//水印透明度       
      // www.jb200.com
        
     //构造函数      
     //$types : 允许上传的文件类型 , $maxsize : 允许大小 ,  $field : 上传控件名称 , $time : 自定义上传时间      
     function upload($types = 'jpg|png', $maxsize = 1024, $field = 'attach', $time = '') {      
         $this->allow_types = explode('|',$types);      
         $this->maxsize = $maxsize * 1024;      
         $this->field = $field;      
         $this->time = $time ? $time : time();      
     }      
       
     //设置并创建文件具体存放的目录      
     //$basedir  : 基目录,必须为物理路径      
     //$filedir  : 自定义子目录,可用参数{y}、{m}、{d}      
     function set_dir($basedir,$filedir = '') {      
         $dir = $basedir;      
         !is_dir($dir) && @mkdir($dir,0777);      
         if (!empty($filedir)) {      
             $filedir = str_replace(array('{y}','{m}','{d}'),array(date('Y',$this->time),date('m',$this->time),date('d',$this->time)),strtolower($filedir));//用string_replace把{y} {m} {d}几个标签进行替换     
             $dirs = explode('/',$filedir);      
             foreach ($dirs as $d) {      
                 !empty($d) && $dir .= $d.'/';      
                 !is_dir($dir) && @mkdir($dir,0777);      
             }      
         }      
         $this->dir = $dir;      
     }      
       
     //图片缩略图设置,如果不生成缩略图则不用设置      
     //$width : 缩略图宽度 , $height : 缩略图高度      
     function set_thumb ($width = 0, $height = 0) {      
         $this->thumb_width  = $width;      
         $this->thumb_height = $height;      
     }      
       
     //图片水印设置,如果不生成添加水印则不用设置      
     //$file : 水印图片 , $pos : 水印位置 , $trans : 水印透明度      
     function set_watermark ($file, $pos = 6, $trans = 80) {      
         $this->watermark_file  = $file;      
         $this->watermark_pos   = $pos;      
         $this->watermark_trans = $trans;      
     }      
       
     /*—————————————————————-    
     执行文件上传,处理完返回一个包含上传成功或失败的文件信息数组,    
     其中:name 为文件名,上传成功时是上传到服务器上的文件名,上传失败则是本地的文件名    
           dir  为服务器上存放该附件的物理路径,上传失败不存在该值    
           size 为附件大小,上传失败不存在该值    
           flag 为状态标识,1表示成功,-1表示文件类型不允许,-2表示文件大小超出    
     —————————————————————–*/    
     function execute() {      
         $files = array(); //成功上传的文件信息      
         $field = $this->field;      
         $keys = array_keys($_FILES[$field]['name']);      
         foreach ($keys as $key) {      
             if (!$_FILES[$field]['name'][$key]) continue;      
                    
             $fileext = $this->fileext($_FILES[$field]['name'][$key]); //获取文件扩展名      
             $filename = date('Ymdhis',$this->time).mt_rand(10,99).'.'.$fileext; //生成文件名      
             $filedir = $this->dir;  //附件实际存放目录      
             $filesize = $_FILES[$field]['size'][$key]; //文件大小      
                    
             //文件类型不允许      
             if (!in_array($fileext,$this->allow_types)) {      
                 $files[$key]['name'] = $_FILES[$field]['name'][$key];      
                 $files[$key]['flag'] = -1;      
                 continue;      
             }      
       
             //文件大小超出      
             if ($filesize > $this->maxsize) {      
                 $files[$key]['name'] = $_FILES[$field]['name'][$key];      
                 $files[$key]['name'] = $filesize;      
                 $files[$key]['flag'] = -2;      
                 continue;      
             }      
       
             $files[$key]['name'] = $filename;      
             $files[$key]['dir'] = $filedir;      
             $files[$key]['size'] = $filesize;      
       
             //保存上传文件并删除临时文件      
             if (is_uploaded_file($_FILES[$field]['tmp_name'][$key])) {      
                 move_uploaded_file($_FILES[$field]['tmp_name'][$key],$filedir.$filename);      
                 @unlink($_FILES[$field]['tmp_name'][$key]);      
                 $files[$key]['flag'] = 1;      
       
                 //对图片进行加水印和生成缩略图,这里演示只支持jpg和png(gif生成的话会没了帧的)      
                 if (in_array($fileext,array('jpg','png'))) {      
                     if ($this->thumb_width) {      
                         if ($this->create_thumb($filedir.$filename,$filedir.'thumb_'.$filename)) {      
                             $files[$key]['thumb'] = 'thumb_'.$filename;  //缩略图文件名      
                         }      
                     }      
                     $this->create_watermark($filedir.$filename);      
                 }      
             }      
         }      
       
         return $files;      
     }      
       
     //创建缩略图,以相同的扩展名生成缩略图      
     //$src_file : 来源图像路径 , $thumb_file : 缩略图路径      
     function create_thumb ($src_file,$thumb_file) {      
         $t_width  = $this->thumb_width;      
         $t_height = $this->thumb_height;      
       
         if (!file_exists($src_file)) return false;      
       
         $src_info = getimagesize($src_file);      
       
         //如果来源图像小于或等于缩略图则拷贝源图像作为缩略图,免去操作      
         if ($src_info[0] <= $t_width && $src_info[1] <= $t_height) {      
             if (!copy($src_file,$thumb_file)) {      
                 return false;      
             }      
             return true;      
         }      
       
         //按比例计算缩略图大小      
         if (($src_info[0]-$t_width) > ($src_info[1]-$t_height)) {      
             $t_height = ($t_width / $src_info[0]) * $src_info[1];      
         } else {      
             $t_width = ($t_height / $src_info[1]) * $src_info[0];      
         }      
       
         //取得文件扩展名      
         $fileext = $this->fileext($src_file);      
       
         switch ($fileext) {      
             case 'jpg' :      
                 $src_img = ImageCreateFromJPEG($src_file); break;      
             case 'png' :      
                 $src_img = ImageCreateFromPNG($src_file); break;      
             case 'gif' :      
                 $src_img = ImageCreateFromGIF($src_file); break;      
         }      
       
         //创建一个真彩色的缩略图像      
         $thumb_img = @ImageCreateTrueColor($t_width,$t_height);      
       
         //ImageCopyResampled函数拷贝的图像平滑度较好,优先考虑      
         if (function_exists('imagecopyresampled')) {      
             @ImageCopyResampled($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);      
         } else {      
             @ImageCopyResized($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);      
         }      
       
         //生成缩略图      
         switch ($fileext) {      
             case 'jpg' :      
                 ImageJPEG($thumb_img,$thumb_file); break;      
             case 'gif' :      
                 ImageGIF($thumb_img,$thumb_file); break;      
             case 'png' :      
                 ImagePNG($thumb_img,$thumb_file); break;      
         }      
       
         //销毁临时图像      
         @ImageDestroy($src_img);      
         @ImageDestroy($thumb_img);      
       
         return true;      
       
     }      
       
     //为图片添加水印      
     //$file : 要添加水印的文件      
     function create_watermark ($file) {      
       
         //文件不存在则返回      
         if (!file_exists($this->watermark_file) || !file_exists($file)) return;      
         if (!function_exists('getImageSize')) return;      
                
         //检查GD支持的文件类型      
         $gd_allow_types = array();      
         if (function_exists('ImageCreateFromGIF')) $gd_allow_types['image/gif'] = 'ImageCreateFromGIF';      
         if (function_exists('ImageCreateFromPNG')) $gd_allow_types['image/png'] = 'ImageCreateFromPNG';      
         if (function_exists('ImageCreateFromJPEG')) $gd_allow_types['image/jpeg'] = 'ImageCreateFromJPEG';      
       
         //获取文件信息      
         $fileinfo = getImageSize($file);      
         $wminfo   = getImageSize($this->watermark_file);      
       
         if ($fileinfo[0] < $wminfo[0] || $fileinfo[1] < $wminfo[1]) return;      
       
         if (array_key_exists($fileinfo['mime'],$gd_allow_types)) {      
             if (array_key_exists($wminfo['mime'],$gd_allow_types)) {      
                        
                 //从文件创建图像      
                 $temp = $gd_allow_types[$fileinfo['mime']]($file);      
                 $temp_wm = $gd_allow_types[$wminfo['mime']]($this->watermark_file);      
       
                 //水印位置      
                 switch ($this->watermark_pos) {                   
                     case 1 :  //顶部居左      
                         $dst_x = 0; $dst_y = 0; break;                    
                     case 2 :    //顶部居中      
                         $dst_x = ($fileinfo[0] - $wminfo[0])/2; $dst_y = 0; break;                      
                     case 3 :  //顶部居右      
                         $dst_x = $fileinfo[0]; $dst_y = 0; break;                     
                     case 4 :  //底部居左      
                         $dst_x = 0; $dst_y = $fileinfo[1]; break;                     
                     case 5 :  //底部居中      
                         $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = $fileinfo[1]; break;           
                     case 6 :  //底部居右      
                         $dst_x = $fileinfo[0]-$wminfo[0]; $dst_y = $fileinfo[1]-$wminfo[1]; break;      
                     default : //随机      
                         $dst_x = mt_rand(0,$fileinfo[0]-$wminfo[0]); $dst_y = mt_rand(0,$fileinfo[1]-$wminfo[1]);      
                 }      
       
                 if (function_exists('ImageAlphaBlending')) ImageAlphaBlending($temp_wm,True); //设定图像的混色模式      
                 if (function_exists('ImageSaveAlpha')) ImageSaveAlpha($temp_wm,True); //保存完整的 alpha 通道信息      
       
                 //为图像添加水印      
                 if (function_exists('imageCopyMerge')) {      
                     ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1],$this->watermark_trans);      
                 } else {      
                     ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1]);      
                 }      
       
                 //保存图片      
                 switch ($fileinfo['mime']) {      
                     case 'image/jpeg' :      
                         @imageJPEG($temp,$file);      
                         break;      
                     case 'image/png' :      
                         @imagePNG($temp,$file);      
                         break;      
                     case 'image/gif' :       
                         @imageGIF($temp,$file);      
                         break;      
                 }      
                 //销毁零时图像      
                 @imageDestroy($temp);      
                 @imageDestroy($temp_wm);      
             }      
         }      
     }      
       
     //获取文件扩展名      
     function fileext($filename) {      
         return strtolower(substr(strrchr($filename,'.'),1,10));      
     }      
 }
 ?>

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