php ajax 文件上传实现代码

一款完整ajax 文件上传功能，我们利用了jquery ajax上传插件来实现的，下面代码非常完整。

上传中，请稍后……

文件上传

请选择要上传的文件:




允许上传的文件类型:gif,jpg,jpge,png




 
 

do_ajax_file_upload.php

$fileelementname = 'filetoupload';
if(isset($_files['filetoupload'])){
    if($_files['filetoupload']['name'] <> ""){
        require_once ('upload_class.php');
        $savepath = "../upfiles/{$_session["suploaddir"]}";
        makedirectory($savepath);
        $fileformat = array('gif','jpg','jpge','png','swf');
        $maxsize = 0;
        $overwrite = 0;
        $f = new clsupload( $savepath, $fileformat, $maxsize, $overwrite);
        $f->setthumb(0);
        if (!$f->run('filetoupload',1)){
        $error.=$f->errmsg();
        }
       $uparrays=$f->getinfo();
       foreach ($uparrays as $uparray) {
           $msg.=$uparray[path].$uparray[savename].",";
       }
       if($msg!=''){$msg=substr($msg,0,-1);}
       echo "{";
       echo    "error: '" . $error . "',n";
       echo    "msg: '" . $msg . "'n";
       echo "}";
    }
}
function makedirectory($directoryname) {
       $directoryname = str_replace("","/",$directoryname);
       $dirnames = explode('/', $directoryname);
       $total = count($dirnames) ;
       $temp = '';
       for($i=0; $i<$total; $i++) {
         $temp .= $dirnames[$i].'/';
         if (!is_dir($temp)) {
            $oldmask = umask(0);
            if (!mkdir($temp, 0777)) exit("不能建立目录 $temp");
            umask($oldmask);
         }
       }
       return true;
}

下面代码保存成upload_class.php
'
class clsupload{
    var $savename;// 保存名
    var $savepath;// 保存路径
    var $fileformat = array('gif','jpg','doc','application/octet-stream');// 文件格式&mime限定
    var $overwrite = 0;// 覆盖模式
    var $maxsize = 0;// 文件最大字节
    var $ext;// 文件扩展名
    var $thumb = 0;// 是否生成缩略图
    var $thumb;// 缩略图宽
    var $thumb;// 缩略图高
    var $thumbprefix = "s_";// 缩略图前缀
    var $errno;// 错误代号
    var $returnarray= array();// 所有文件的返回信息
    var $returninfo= array();// 每个文件返回信息

    function clsupload($savepath, $fileformat='',$maxsize = 0, $overwrite = 0) {
           $this->setsavepath($savepath);
           $this->setfileformat($fileformat);
           $this->setmaxsize($maxsize);
           $this->setoverwrite($overwrite);
           $this->setthumb($this->thumb, $this->thumbwidth,$this->thumbheight);
           $this->errno = 0;
    }

    // 上传
    function run($fileinput,$changename = 1){
           if(isset($_files[$fileinput])){
             $filearr = $_files[$fileinput];
             if(is_array($filearr['name'])){//上传同文件域名称多个文件
                for($i = 0; $i < count($filearr['name']); $i++){
                       $ar['tmp_name'] = $filearr['tmp_name'][$i];
                       $ar['name'] = $filearr['name'][$i];
                       $ar['type'] = $filearr['type'][$i];
                       $ar['size'] = $filearr['size'][$i];
                       $ar['error'] = $filearr['error'][$i];
                       $this->getext($ar['name']);//取得扩展名，赋给$this->ext，下次循环会更新
                       $this->setsavename($changename == 1 ? '' : $ar['name']);//设置保存文件名
                       if($this->copyfile($ar)){
                         $this->returnarray[] =   $this->returninfo;
                       }else{
                         $this->returninfo['error'] = $this->errmsg();
                         $this->returnarray[] =   $this->returninfo;
                       }
                }
                return $this->errno ?   false :   true;
             }else{//上传单个文件
                $this->getext($filearr['name']);//取得扩展名
                $this->setsavename($changename == 1 ? '' : $filearr['name']);//设置保存文件名
                if($this->copyfile($filearr)){
                       $this->returnarray[] =   $this->returninfo;
                }else{
                       $this->returninfo['error'] = $this->errmsg();
                       $this->returnarray[] =   $this->returninfo;
                }
                return $this->errno ?   false :   true;
             }
             return false;
           }else{
             $this->errno = 10;
             return false;
           }
    }
    // 单个文件上传
    function copyfile($filearray){
           $this->returninfo = array();
           // 返回信息
           $this->returninfo['name'] = $filearray['name'];
           $this->returninfo['savename'] = $this->savename;
           $this->returninfo['size'] = number_format( ($filearray['size'])/1024 , 0, '.', ' ');//以kb为单位
           $this->returninfo['type'] = $filearray['type'];
           $this->returninfo['path'] = $this->savepath;
           // 检查文件格式
           if (!$this->validateformat()){
             $this->errno = 11;
             return false;
           }
           // 检查目录是否可写
           if(!@is_writable($this->savepath)){
             $this->errno = 12;
             return false;
           }
           // 如果不允许覆盖，检查文件是否已经存在
           if($this->overwrite == 0 && @file_exists($this->savepath.$filearray['name'])){
             $this->errno = 13;
             return false;
           }
           // 如果有大小限制，检查文件是否超过限制
           if ($this->maxsize != 0 ){
             if ($filearray["size"] > $this->maxsize){
                $this->errno = 14;
                return false;
             }
           }
           // 文件上传
           if(!@copy($filearray["tmp_name"], $this->savepath.$this->savename)){
             $this->errno = $filearray["error"];
             return false;
           }elseif( $this->thumb ){//创建缩略图
             $createfunction = "imagecreatefrom".($this->ext == 'jpg' ? 'jpeg' : $this->ext);
             $savefunction = "image".($this->ext == 'jpg' ? 'jpeg' : $this->ext);
             if (strtolower($createfunction) == "imagecreatefromgif"
                && !function_exists("imagecreatefromgif")) {
                $this->errno = 16;
                return false;
             } elseif (strtolower($createfunction) == "imagecreatefromjpeg"
                && !function_exists("imagecreatefromjpeg")) {
                $this->errno = 17;
                return false;
             } elseif (!function_exists($createfunction)) {
                $this->errno = 18;
                return false;
             }
               
             $original = @$createfunction($this->savepath.$this->savename);
             if (!$original) {$this->errno = 19; return false;}
             $originalheight = imagesy($original);
             $originalwidth = imagesx($original);
             $this->returninfo['originalheight'] = $originalheight;
             $this->returninfo['originalwidth'] = $originalwidth;
             if (($originalheight < $this->thumbheight
                && $originalwidth < $this->thumbwidth)) {
                // 如果比期望的缩略图小，那只copy
                copy($this->savepath.$this->savename,
                       $this->savepath.$this->thumbprefix.$this->savename);
             } else {
                if( $originalwidth > $this->thumbwidth ){// 宽 > 设定宽度
                       $thumbwidth = $this->thumbwidth ;
                       $thumbheight = $this->thumbwidth * ( $originalheight / $originalwidth );
                       if($thumbheight > $this->thumbheight){//高 > 设定高度
                         $thumbwidth = $this->thumbheight * ( $thumbwidth / $thumbheight );
                         $thumbheight = $this->thumbheight ;
                       }
                }elseif( $originalheight > $this->thumbheight ){//高 > 设定高度
                       $thumbheight = $this->thumbheight ;
                       $thumbwidth = $this->thumbheight * ( $originalwidth / $originalheight );
                       if($thumbwidth > $this->thumbwidth){//宽 > 设定宽度
                         $thumbheight = $this->thumbwidth * ( $thumbheight / $thumbwidth );
                         $thumbwidth = $this->thumbwidth ;
                       }
                }
                if ($thumbwidth == 0) $thumb;
                if ($thumbheight == 0) $thumb;
                $createdthumb = imagecreatetruecolor($thumbwidth, $thumbheight);
                if ( !$createdthumb ) {$this->errno = 20; return false;}
                if ( !imagecopyresampled($createdthumb, $original, 0, 0, 0, 0,
                       $thumbwidth, $thumbheight, $originalwidth, $originalheight) )
                       {$this->errno = 21; return false;}
                if ( !$savefunction($createdthumb,
                       $this->savepath.$this->thumbprefix.$this->savename) )
                       {$this->errno = 22; return false;}
             }
           }
           // 删除临时文件
           if(!@$this->del($filearray["tmp_name"])){
             return false;
           }
           return true;
    }
    // 文件格式检查,mime检测
    function validateformat(){
           if(!is_array($this->fileformat)
             || in_array(strtolower($this->ext), $this->fileformat)
             || in_array(strtolower($this->returninfo['type']), $this->fileformat) )
             return true;
           else
             return false;
    }
    //获取文件扩展名
    function getext($filename){
           $ext = explode(".", $filename);
           $ext = $ext[count($ext) - 1];
           $this->ext = strtolower($ext);
    }
    //设置上传文件的最大字节限制 0:表示无限制
    function setmaxsize($maxsize){
           $this->maxsize = $maxsize;
    }
    //设置文件格式限定
    function setfileformat($fileformat){
           if(is_array($fileformat)){$this->fileformat = $fileformat ;}
    }
    //设置覆盖模式  1:允许覆盖 0:禁止覆盖
    function setoverwrite($overwrite){
           $this->overwrite = $overwrite;
    }
    //设置保存路径
    function setsavepath($savepath){
           $this->savepath = substr( str_replace("","/", $savepath) , -1) == "/" ? $savepath : $savepath."/";
    }
    //设置缩略图
    function setthumb($thumb, $thumb,$thumb){
           $this->thumb = $thumb;
           if($thumbwidth) $this->thumbwidth = $thumbwidth;
           if($thumbheight) $this->thumbheight = $thumbheight;
    }
    //设置文件保存名
    function setsavename($savename){
           if ($savename == ''){   // 如果未设置文件名，则生成一个随机文件名
             $name = date('ymdhis')."_".rand(100,999).'.'.$this->ext;
           } else {
             $name = $savename;
           }
           $this->savename = $name;
    }
    //删除文件
    function del($filename){
           if(!@unlink($filename)){
             $this->errno = 15;
             return false;
           }
           return true;
    }
    // 返回上传文件的信息
    function getinfo(){
           return $this->returnarray;
    }
    // 得到错误信息
    function errmsg(){
           $uploadclasserror = array(
             0 =>'there is no error, the file uploaded with success. ',
             1 =>'the uploaded file exceeds the upload_max_filesize directive in php.ini.',
             2 =>'the uploaded file exceeds the max_file_size that was specified in the html form.',
             3 =>'the uploaded file was only partially uploaded. ',
             4 =>'no file was uploaded. ',
             6 =>'missing a temporary folder. introduced in php 4.3.10 and php 5.0.3. ',
             7 =>'failed to write file to disk. introduced in php 5.1.0. ',
             10 =>'input name is not unavailable!',
             11 =>'the uploaded file is unallowable!',
             12 =>'directory unwritable!',
             13 =>'file exist already!',
             14 =>'file is too big!',
             15 =>'delete file unsuccessfully!',
             16 =>'your version of php does not appear to have gif thumbnailing support.',
             17 =>'your version of php does not appear to have jpeg thumbnailing support.',
             18 =>'your version of php does not appear to have pictures thumbnailing support.',
             19 =>'an error occurred while attempting to copy the source image .
                       your version of php ('.phpversion().') may not have this image type support.',
             20 =>'an error occurred while attempting to create a new image.',
             21 =>'an error occurred while copying the source image to the thumbnail image.',
             22 =>'an error occurred while saving the thumbnail image to the filesystem.
                       are you sure that php has been configured with both read and write access on this folder?',
                );
           if ($this->errno == 0)
             return false;
           else
             return $uploadclasserror[$this->errno];
    }
}