php如何生成缩略图的文件上传类（附代码）
这篇文章主要介绍了php可生成缩略图的文件上传类,给出了完整的类文件代码及其相应的用法示例,非常具有实用价值,需要的朋友可以参考下。
类文件调用方法如下：
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',$this->time),date('d',$this->time)),strtolower($filedir));
$dirs = explode('/',$filedir);
foreach ($dirs as $d) {
!emptyempty($d) && $dir .= $d.'/';
!is_dir($dir) && @mkdir($dir,0777);
}
}
$this->dir = $dir;
}
//图片缩略图设置，如果不生成缩略图则不用设置
//$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,$src_img,0,0,0,0,$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,$dst_y,0,0,$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));
}
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