推薦：解析在PHP中使用mysqli擴展庫對mysql的操作
本篇文章是對在PHP中使用mysqli擴展庫對mysql的操作進行了詳細的分析介紹，需要的朋友參考下 1、在PHP中 使用mysqli擴展庫對mysql 的dql操作 復制代碼 代碼如下: ?php header(Content-type: text/html;charset=utf-8); //mysqli操作mysql數(shù)據(jù)庫(面向?qū)ο蠓绞? //1、創(chuàng)建

<?php
    class Upload{
        public $upload_name; //上傳文件名
        public $upload_tmp_path; //上傳文件保存到服務器的temp路徑
        public $file_size;
        public $file_type;
        public $file_save_path;
        function __construct(){
            $this->upload_name=$_FILES['myfile']['name'];
            $this->upload_tmp_path=$_FILES['myfile']['tmp_name'];
            $this->file_size=$_FILES['myfile']['size'];
            $this->file_type=$_FILES['myfile']['type'];
            $this->allow_file_type = array('jpeg','jpg','png','gif','bmp','doc','zip','rar','txt','wps','xlsx','ppt');
            $this->file_save_path=$_SERVER['DOCUMENT_ROOT']."/file/up/";
        }
        public function upload_file($username){
            //判斷文件大小
            if($this->file_size>2*1024*1024){
                echo "<script type='text/javascript'>window.alert('文件不能大于2M')</script>";
                exit();
            }
            //獲取文件類型
/*            if($this->file_type!="image/jpeg" && $this->file_type!="image/pjpeg"){
                echo "文件類型只能是 jpg 格式";
                exit();
            }
*/            //獲取文件的擴展名
            $file_type=$this->getFileExt($this->upload_name);
            if(!in_array($file_type,$this->allow_file_type)){
                echo "上傳文件類型格式錯誤";
                exit();
            }           
            //判斷上傳是否OK
            if(is_uploaded_file($this->upload_tmp_path)){

                //防止圖片覆蓋問題，為每個用戶建立一個文件夾   
                $user_path=$this->file_save_path.$username;
                if(!file_exists($user_path)){
                    mkdir ($user_path);
                }
                //$move_to_file=$user_path."/".$_FILES['myfile']['name'];
                //防止用戶上傳用戶名相同的問題
                //$file_true_name=$_FILES['myfile']['name'];
                $move_to_file=$user_path."/".time().rand(1,1000).substr($this->upload_name,strripos($this->upload_name,"."));
                //echo $upload_file.$move_to_file;
                //中文要轉(zhuǎn)碼
                if(move_uploaded_file($this->upload_tmp_path,iconv("utf-8","gb2312","$move_to_file"))){
                    echo $this->upload_name."上傳成功";
                }else{
                    echo "上傳失敗";
                }
            }else{
                echo "上傳失敗";
            }
        }

        //獲取文件的擴展名
        public function getFileExt($filename){
            $fileExt=pathinfo($filename);
            return $fileExt["extension"];
        }
    }
?>

分享：淺析PHP繪圖技術(shù)
1、圖片格式：目前網(wǎng)站開發(fā)常見的圖片格式有g(shù)if,jpg/jpeg,png ..... 區(qū)別： gif 圖片壓縮率高，但是只能顯示256色，可能造成顏色的丟失，可以顯示動畫 jpg/jpeg 圖片壓縮率高(有損壓縮)，可以用較小的文件來顯示，網(wǎng)頁上用得比較多 png 該格式綜合了gif和jpg的優(yōu)勢，缺