这款文件上传实用代码,可以方便的上传你指定的文件或图片,同时也可以快速的限制上传图片文件类或大小,实例代码如下:

<?php
/*
 * created on 2010-6-21
 *
 * the class for image to upload
 *
 * made by s71ence
 *
 * @$user_id
 * @$max_file_size
 * @$max_image_side
 * @$destination_folder
 *
 * return:
 * @$_cookie['img_path']
 * @$img_unfind
 * @$img_type
 * @$mkdir_warry
 * @$img_side_too_big
 * @$img_exist
 * @$img_move
 * @$img_upload_sucess
*/
header('content-type:text/html;charset=utf-8');
class image_upload extends fn_function {
    private $user_id;
    private $max_file_size; //allow the image's size
    private $max_image_side; //allow the image's side
    private $destination_folder; //image's storage path
    private $img_preview;
    private $img_preview_size;
    private $cookie_set; //the cookie's name
    function __construct($user_id, $max_file_size, $max_image_side, $destination_folder, $img_preview, $img_preview_size, $cookie_set) {
        $this->user_id = $user_id;
        $this->max_file_size = $max_file_size;
        $this->max_image_side = $max_image_side;
        $this->destination_folder = $destination_folder;
        $this->img_preview = $img_preview;
        $this->img_preview_size = $img_preview_size;
        $this->cookie_set = $cookie_set;
        $this->get_date();
        $this->get_image_type();
    }
    private function get_date() {
        $this->date = fn_function::get_server_date();
        return $this->date;
    }
    function get_image_type() {
        $this->up_img_types = array(
            'image/jpg',
            'image/jpeg',
            'image/png',
            'image/pjpeg',
            'image/gif',
            'image/bmp',
            'image/x-png'
        );
        return $this->up_img_types;
    }
    function upload_image() {
        if ($_server['request_method'] == 'post') {
            //check the iamge is exist
            if (!is_uploaded_file($_files["upfile"]["tmp_name"])) {
                return $img_unfind = fn_function::alert_msg('图片不存在!');
                exit;
            }
            $file = $_files["upfile"];
            //check the iamge's size
            if ($this->max_file_size < $file["size"]) {
                return $img_side_too_big = fn_function::alert_msg('图片大小超过系统允许最大值!');
                exit;
            }
            //check the iamge's type
            if (!in_array($file["type"], $this->up_img_types)) {
                return $img_type = fn_function::alert_msg('图片类型不符!');
                exit;
            }
            if (!file_exists($this->destination_folder)) {
                if (!fn_function::mkdirs($this->destination_folder)) {
                    return $mkdir_warry = fn_function::alert_msg('目录创建失败!');
                    exit;
                }
            }
            $file_name = $file["tmp_name"];
            $image_size = getimagesize($file_name);
            $pinfo = pathinfo($file["name"]);
            $file_type = $pinfo['extension'];
            $destination = $this->destination_folder . time() . "." . $file_type;
            setcookie($this->cookie_set, $destination);
            if ($image_size[0] > $this->max_image_side || $image_size[1] > $this->max_image_side) {
                return $img_side_too_big = fn_function::alert_msg('图片分辨率超过系统允许最大值!');
                exit;
            }
            $overwrite = "";
            if (file_exists($destination) && $overwrite != true) {
                return $img_exist = fn_function::alert_msg('同名文件已经存在了!');
                exit;
            }
            if (!move_uploaded_file($file_name, $destination)) {
                return $img_move = fn_function::alert_msg('移动文件出错!');
                exit;
            }
            $img_upload_sucess = "<font color=red face=微软雅黑>上传成功</font><br>";
            if ($this->img_preview == 1) {
                $img_src = "<img src="".$destination."" width=" . ($image_size[0] * $this->img_preview_size) . " height=" . ($image_size[1] * $this->img_preview_size); //开源代码phprm.com
                $img_upload_sucess.= $img_src;
            }
            return $img_upload_sucess;
        }
    }
    function __destruct() {
        //clear
        
    }
}
?>

文章网址:http://www.phprm.com/scxz/fs5119.html

随意转载^^但请附上教程地址。