php可生成缩略图的文件上传类实例

php文件处理类

本文实例讲述了php可生成缩略图的文件上传类及其用法。分享给大家供大家参考。具体实现方法如下:

?php//————————————-//————————————-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 $watermark_trans;//水印透明度
//构造函数 //$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)) { $filedir =
str_replace(array(‘{y}’,'{m}’,'{y}’),array(date(‘Y’,$this-time),date(‘m’,$this-time),date(‘d’,$this-time)),strtolower($filedir));
$dirs = explode(‘/’,$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 = $this-time.mt_rand(100,999).’.’.$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][‘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 if
(in_array($fileext,array(‘jpg’,’png’,’gif’))) { if ($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 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)); }}?

类文件调用方法如下:

复制代码 代码如下: if ($_GET[‘action’]
== ‘save’) {        
       
    $up = new upload();        
   
$up->set_dir(dirname(apizl_file).’/upload/’,'{y}/{m}’);        
    $up->set_thumb(100,80);        
   
$up->set_watermark(dirname(apizl_file).’/jblog/images/watermark.png’,6,90);        
    $fs = $up->execute();        
       
    var_dump($fs);        
}     
?>
        
   

test

        
            
   

        
                
                
                
   

        
            

upload上传类文件如下:

复制代码 代码如下: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         
        
    //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($dir,0777);        
        if (!emptyempty($filedir)) {        
            $filedir =
str_replace(array(‘{y}’,'{m}’,'{d}’),array(date(‘Y’,$this->time),date(‘m’,$this->time),date(‘d’,$this->time)),strtolower($filedir));        
            $dirs = explode(‘/’,$filedir);        
            foreach ($dirs as $d) {        
                !emptyempty($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        
                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        
        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));        
    }        
}

希望本文所述对大家的PHP程序设计有所帮助。

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