php可生成缩略图的文件上传类实例
发布时间：2020-12-13 02:16:36 所属栏目：PHP教程 来源：网络整理
导读：《PHP实战：php可生成缩略图的文件上传类实例》要点： 本文介绍了PHP实战：php可生成缩略图的文件上传类实例，希望对您有用。如果有疑问，可以联系我们。 本篇章节讲解php可生成缩略图的文件上传类及其用法.供大家参考研究.具体实现办法如下： PHP教
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《PHP实战：php可生成缩略图的文件上传类实例》要点： 本篇章节讲解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.具体实现办法如下：PHP教程 类文件调用办法如下：PHP教程
代码如下:
<?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 传" />???????? ??? </form>???????? ??? </body>???????? </html> upload上传类文件如下：
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',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,$src_img,$t_width,$t_height,$src_info[0],$src_info[1]);???????? ??????? } else {???????? ??????????? @ImageCopyResized($thumb_img,$src_info[1]);???????? ??????? }???????? ??????? ??????? //生成缩略图???????? ??????? switch ($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,$dst_y,$wminfo[0],$wminfo[1],$this->watermark_trans);???????? ??????????????? } else {???????? ??????????????????? ImageCopyMerge($temp,$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程序设计有所赞助.PHP教程 欢迎参与《PHP实战：php可生成缩略图的文件上传类实例》讨论，分享您的想法，编程之家 52php.cn为您提供专业教程。 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |