php文件上傳類可生成縮略圖代碼

2024-09-04 11:45:06

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<?php

if ($_GET['action'] == 'save') {



    $up = new upload();

    $up->set_dir(dirname(__FILE__).'/upload/','{y}/{m}');

    $up->set_thumb(100,80);

    $up->set_watermark(dirname(__FILE__).'/jblog/images/watermark.png',6,90);

    $fs = $up->execute();



    var_dump($fs);

}



?>

<html>

    <head><title>test</title></head>

    <body style="margin:0;padding:0">

    <form name="upload" method="post" action="?action=save" enctype="multipart/form-data" style="margin:0">

        <input type="file" name="attach[]" />

        <input type="file" name="attach[]" />

        <input type="submit" name="submit" value="上傳" />

    </form>

    </body>

</html>

class upload {



    var $dir;            //附件存放物理目錄

    var $time;           //自定義文件上傳時間

    var $allow_types;    //允許上傳附件類型

    var $field;          //上傳控件名稱

    var $maxsize;        //最大允許文件大小，單位為KB



    var $thumb_width;    //縮略圖寬度

    var $thumb_height;   //縮略圖高度



    var $watermark_file; //水印圖片地址

    var $watermark_pos;  //水印位置

    var $watermark_trans;//水印透明度

    //開源代碼Vevb.com



    //構造函數

    //$types : 允許上傳的文件類型 , $maxsize : 允許大小 ,  $field : 上傳控件名稱 , $time : 自定義上傳時間

    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();

    }



    //設置并創建文件具體存放的目錄

    //$basedir  : 基目錄，必須為物理路徑

    //$filedir  : 自定義子目錄，可用參數{y}、{m}、1vtdddr

    function set_dir($basedir,$filedir = '') {

        $dir = $basedir;

        !is_dir($dir) && @mkdir($dir,0777);

        if (!emptyempty($filedir)) {

            $filedir = str_replace(array('{y}','{m}','hrtttrj'),array(date('Y',$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;

    }



    //圖片縮略圖設置，如果不生成縮略圖則不用設置

    //$width : 縮略圖寬度 , $height : 縮略圖高度

    function set_thumb ($width = 0, $height = 0) {

        $this->thumb_width  = $width;

        $this->thumb_height = $height;

    }



    //圖片水印設置，如果不生成添加水印則不用設置

    //$file : 水印圖片 , $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;

    }



    /*----------------------------------------------------------------

    執行文件上傳，處理完返回一個包含上傳成功或失敗的文件信息數組，

    其中：name 為文件名，上傳成功時是上傳到服務器上的文件名，上傳失敗則是本地的文件名

          dir  為服務器上存放該附件的物理路徑，上傳失敗不存在該值

          size 為附件大小，上傳失敗不存在該值

          flag 為狀態標識，1表示成功，-1表示文件類型不允許，-2表示文件大小超出

    -----------------------------------------------------------------*/

    function execute() {

        $files = array(); //成功上傳的文件信息

        $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]); //獲取文件擴展名

            $filename = date('Ymdhis',$this->time).mt_rand(10,99).'.'.$fileext; //生成文件名

            $filedir = $this->dir;  //附件實際存放目錄

            $filesize = $_FILES[$field]['size'][$key]; //文件大小



            //文件類型不允許

            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;



            //保存上傳文件并刪除臨時文件

            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;



                //對圖片進行加水印和生成縮略圖

                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;  //縮略圖文件名

                        }

                    }

                    $this->create_watermark($filedir.$filename);

                }

            }

        }



        return $files;

    }



    //創建縮略圖,以相同的擴展名生成縮略圖

    //$src_file : 來源圖像路徑 , $thumb_file : 縮略圖路徑

    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);



        //如果來源圖像小于或等于縮略圖則拷貝源圖像作為縮略圖

        if ($src_info[0] <= $t_width && $src_info[1] <= $t_height) {

            if (!copy($src_file,$thumb_file)) {

                return false;

            }

            return true;

        }



        //按比例計算縮略圖大小

        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];

        }



        //取得文件擴展名

        $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;

        }



        //創建一個真彩色的縮略圖像

        $thumb_img = @ImageCreateTrueColor($t_width,$t_height);



        //ImageCopyResampled函數拷貝的圖像平滑度較好，優先考慮

        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]);

        }



        //生成縮略圖

        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;

        }



        //銷毀臨時圖像

        @ImageDestroy($src_img);

        @ImageDestroy($thumb_img);



        return true;



    }



    //為圖片添加水印

    //$file : 要添加水印的文件

    function create_watermark ($file) {



        //文件不存在則返回

        if (!file_exists($this->watermark_file) || !file_exists($file)) return;

        if (!function_exists('getImageSize')) return;



        //檢查GD支持的文件類型

        $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';



        //獲取文件信息

        $fileinfo = getImageSize($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)) {



                //從文件創建圖像

                $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 :  //頂部居左

                        $dst_x = 0; $dst_y = 0; break;

                    case 2 :  //頂部居中

                        $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = 0; break;

                    case 3 :  //頂部居右

                        $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 : //隨機

                        $dst_x = mt_rand(0,$fileinfo[0]-$wminfo[0]); $dst_y = mt_rand(0,$fileinfo[1]-$wminfo[1]);

                }



                if (function_exists('ImageAlphaBlending')) ImageAlphaBlending($temp_wm,True); //設定圖像的混色模式

                if (function_exists('ImageSaveAlpha')) ImageSaveAlpha($temp_wm,True); //保存完整的 alpha 通道信息



                //為圖像添加水印

                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]);

                }



                //保存圖片

                switch ($fileinfo['mime']) {

                    case 'image/jpeg' :

                        @imageJPEG($temp,$file);

                        break;

                    case 'image/png' :

                        @imagePNG($temp,$file);

                        break;

                    case 'image/gif' :

                        @imageGIF($temp,$file);

                        break;

                }

                //銷毀零時圖像

                @imageDestroy($temp);

                @imageDestroy($temp_wm);

            }

        }

    }



    //獲取文件擴展名

    function fileext($filename) {

        return strtolower(substr(strrchr($filename,'.'),1,10));

    }

}