php SWFUpload 怎么创建缩略图并且保存到指定文件夹里面
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2022-04-29 19:52:29
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1.upload.php
<?php
/*
* swfupload图片上传
*/
if (isset($_POST["PHPSESSID"])) {
session_id($_POST["PHPSESSID"]);
}
session_start();
ini_set("html_errors", "0");
if (!isset($_FILES["Filedata"]) || !is_uploaded_file($_FILES["Filedata"]["tmp_name"]) ||$_FILES["Filedata"]["error"] != 0) {
echo "错误:无效的上传!";
exit(0);
}
// Get the image and create a thumbnail
$file_types=explode(".",$_FILES["Filedata"]["name"]);
$file_type=$file_types[count($file_types)-1];
if(strtolower($file_type)=='gif' )
{
$img = imagecreatefromgif($_FILES["Filedata"]["tmp_name"]);
}
else if(strtolower($file_type)=='png')
{
$img = imagecreatefrompng($_FILES["Filedata"]["tmp_name"]);
}
else if(strtolower($file_type)=='bmp')
{
$img = imagecreatefromwbmp($_FILES["Filedata"]["tmp_name"]);
}
else
{
$img = imagecreatefromjpeg($_FILES["Filedata"]["tmp_name"]);
}
if (!$img) {
echo "错误:无法创建图像 ". $_FILES["Filedata"]["tmp_name"];
exit(0);
}
$width = imageSX($img);
$height = imageSY($img);
if (!$width || !$height) {
echo "错误：无效的高或高";
exit(0);
}
// Build the thumbnail
$target_width = 100;
$target_height = 100;
$target_ratio = $target_width / $target_height;
$img_ratio = $width / $height;
if ($target_ratio > $img_ratio) {
$new_height = $target_height;
$new_width = $img_ratio * $target_height;
} else {
$new_height = $target_width / $img_ratio;
$new_width = $target_width;
}
if ($new_height > $target_height) {
$new_height = $target_height;
}
if ($new_width > $target_width) {
$new_height = $target_width;
}
$new_img = ImageCreateTrueColor(100, 100);
if (!@imagefilledrectangle($new_img, 0, 0, $target_width-1, $target_height-1, 0)) { // Fill the image black
echo "错误：不能填充新图片";
exit(0);
}
if (!@imagecopyresampled($new_img, $img, ($target_width-$new_width)/2, ($target_height-$new_height)/2, 0,0, $new_width, $new_height, $width, $height)) {
echo "错误：不能调整大小的图像";
exit(0);
}
if (!isset($_SESSION["file_info"])) {
$_SESSION["file_info"] = array();
}
ob_start();
imagejpeg($new_img);
$imagevariable = ob_get_contents();
ob_end_clean();
$file_id = md5($_FILES["Filedata"]["tmp_name"] + rand()*100000);
$_SESSION["file_info"][$file_id] = $imagevariable;
echo "FILEID:" . $file_id; // Return the file id to the script
include("upimg.class.php");
if(!empty($_FILES["Filedata"]) and count(explode(",",$_SESSION["upload_tem"]))<5)
{
$folder="upload/images/tem/".date("Y-m-d");
$up = new upimg("$folder","$folder"); //可以写成：$up = new upimg();
$up->autoThumb = TRUE; //可省略
$up->srcDel=TRUE;
$up->thumbWidth = 550; //可省略
$up->thumbHeight = 400; //可省略
$up->maxsize=2014; //上传文件大小单位是kb
$result= $up->upload('Filedata'); // HTML中<input />的name属性值
$_SESSION["upload_tem"]=$_SESSION["upload_tem"].",".$up->thumbPath;
$_SESSION["upload_tem"]=trim($_SESSION["upload_tem"],",");
}
?>
2.生成缩略图类upimg.class.php
<?php
class upimg{
public $uploadFolder = 'upload'; // 图片存放目录
public $thumbFolder = 'upload/thumb'; // 缩略图存放目录
public $thumbWidth = ''; // 缩略图宽度
public $thumbHeight = ''; // 缩略图高度
public $autoThumb = ''; // 是否自动生成缩略图
public $error = ''; // 错误信息
public $imgPath = ''; // 上传成功后的图片位置
public $thumbPath = ''; // 上传成功后的缩略图位置
public $maxsize='';
// 说明：初始化，创建存放目录
function __construct($uploadFolder = 'upload', $thumbFolder = 'upload/thumb'){
$this->uploadFolder = $uploadFolder;
$this->thumbFolder = $thumbFolder;
$this->_mkdir();
}
// 说明：上传图片，参数是<input />的name属性值；成功返回图片的相对URL，失败返回FALSE和错误信息（在$this->error里）
// bool/sting upload(string $html_tags_input_attrib_name);
function upload($inputName){ // 上传操作，参数是input标签的name属性。
if ($this->error){ // 如果有错，直接返回（例如_mkdir）
return FALSE;
}
if(!$_FILES[$inputName]["name"]){
$this->error = '没有上传图片';
return FALSE;
}
//检测文件大小
if($_FILES[$inputName]["size"] > ($this->maxsize*1024)){
$this->error = '上传文件'.$inputName.'太大，最大支持'.ceil($this->maxsize/1024).'kb的文件';
return FALSE;
}
if($_FILES[$inputName]["name"]){
$isUpFile = $_FILES[$inputName]['tmp_name'];
if (is_uploaded_file($isUpFile)){
$imgInfo = $this->_getinfo($isUpFile);
if (FALSE == $imgInfo){
return FALSE;
}
$extName = $imgInfo['type'];
$microSenond = floor(microtime()*10000);// 取一个毫秒级数字,4位。
$newFileName = $uploadFolder . '/' . date('YmdHis') . $microSenond . '.' . $extName ; // 所上传图片的新名字。
$location = $this->uploadFolder . $newFileName;
$result = move_uploaded_file($isUpFile, $location);
if ($result)
{
if (TRUE == $this->autoThumb)
{ // 是否生成缩略图
$thumb = $this->thumb($location, $this->thumbWidth, $this->thumbHeight);
if (FALSE == $thumb)
{
return FALSE;
}
}
//是否删除原图
if(TRUE==$this->srcDel)
{
@unlink ($location);
}
$this->imgPath = $location;
return $location;
}else{
$this->error = '移动临时文件时出错';
return FALSE;
}
}else{
$uploadError = $_FILES[$inputName]['error'];
if (1 == $uploadError){ // 文件大小超过了php.ini中的upload_max_filesize
$this->error = '文件太大，服务器拒绝接收大于' . ini_get('upload_max_filesize') . '的文件';
return FALSE;
}elseif (3 == $uploadError){ // 上传了部分文件
$this->error = '上传中断，请重试';
return FALSE;
}elseif (4 == $uploadError){
$this->error = '没有文件被上传';
return FALSE;
}elseif (6 == $uploadError){
$this->error = '找不到临时文件夹，请联系您的服务器管理员';
return FALSE;
}elseif (7 == $uploadError){
$this->error = '文件写入失败，请联系您的服务器管理员';
return FALSE;
}else{
if (0 != $uploadError){
$this->error = '未知上传错误，请联系您的服务器管理员';
return FALSE;
}
} // end if $uploadError
} // end if is_uploaded_file else
} // end if $_FILES[$inputName]["name"]
}
// 说明：获取图片信息，参数是上传后的临时文件，成功返回数组，失败返回FALSE和错误信息
// array/bool _getinfo(string $upload_tmp_file)
private function _getinfo($img){
if (!file_exists($img)){
$this->error = '找不到图片，无法获取其信息';
return FALSE;
}
$tempFile = @fopen($img, "rb");
$bin = @fread($tempFile, 2); //只读2字节
@fclose($tempFile);
$strInfo = @unpack("C2chars", $bin);
$typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
$fileType = '';
switch ($typeCode){ // 6677:bmp 255216:jpg 7173:gif 13780:png 7790:exe 8297:rar 8075:zip tar:109121 7z:55122 gz 31139
case '255216':
$fileType = 'jpg';
break;
case '6677':
$fileType = 'bmp';
break;
case '7173':
$fileType = 'gif';
break;
case '13780':
$fileType = 'png';
break;
default:
$fileType = 'unknown';
}
if ($fileType == 'jpg' || $fileType == 'gif' || $fileType == 'png' || $fileType == 'bmp'){
$imageInfo = getimagesize($img);
$imgInfo['size'] = $imageInfo['bits'];
$imgInfo["type"] = $fileType;
$imgInfo["width"] = $imageInfo[0];
$imgInfo["height"] = $imageInfo[1];
return $imgInfo;
}else{ // 非图片类文件信息
$this->error = '图片类型错误';
return FALSE;
}
} // end _getinfo
// 说明：生成缩略图，等比例缩放或拉伸
// bool/string thumb(string $uploaded_file, int $thumbWidth, int $thumbHeight, string $thumbTail);
function thumb($img, $thumbWidth = 300, $thumbHeight = 200,$thumbTail = '_thumb')
{
$filename = $img; // 保留一个名字供新的缩略图名字使用
$imgInfo = $this->_getinfo($img,$i);
if(FALSE == $imgInfo)
{
return FALSE;
}
$imgType = $imgInfo['type'];
switch ($imgType)
{ // 创建一个图，并给出扩展名
case "jpg" :
$img = imagecreatefromjpeg($img);
$extName = 'jpg';
break;
case 'gif' :
$img = imagecreatefromgif($img);
$extName = 'gif';
break;
case 'bmp' :
$img = imagecreatefromgif($img);
$extName = 'bmp';
break;
case 'png' :
$img = imagecreatefrompng($img);
$extName = 'png';
break;
default : // 如果类型错误，生成一张空白图
$img = imagecreate($thumbWidth,$thumbHeight);
imagecolorallocate($img,0x00,0x00,0x00);
$extName = 'jpg';
}
// 缩放后的图片尺寸(小则拉伸，大就缩放)
$imgWidth = $imgInfo['width'];
$imgHeight = $imgInfo['height'];
if($imgHeight > $imgWidth)
{ // 竖图
$newHeight = $thumbHeight;
$newWidth = ceil($imgWidth / ($imgHeight / $thumbHeight ));
}
else if($imgHeight < $imgWidth)
{ // 横图
$newHeight = ceil($imgHeight / ($imgWidth / $thumbWidth ));
$newWidth = $thumbWidth;
}
else if($imgHeight == $imgWidth)
{ // 等比例图
$newHeight = $thumbWidth;
$newWidth = $thumbWidth;
}
$bgimg = imagecreatetruecolor($newWidth,$newHeight);
$bg = imagecolorallocate($bgimg,0x00,0x00,0x00);
imagefill($bgimg,0,0,$bg);
$sampled = imagecopyresampled($bgimg,$img,0,0,0,0,$newWidth,$newHeight,$imgWidth,$imgHeight);
if(!$sampled )
{
$this->error = '缩略图生成失败';
$this->path=$this->uploadFolder . '/' . $filename;
return FALSE;
}
$filename = basename($filename);
$newFileName = substr($filename, 0, strrpos($filename, ".")) . $thumbTail . '.' . $extName ; // 新名字
$thumbPath = $this->thumbFolder . '/' . $newFileName;
switch ($extName){
case 'jpg':
$result = imagejpeg($bgimg, $thumbPath);
break;
case 'gif':
$result = imagegif($bgimg, $thumbPath);
break;
case 'png':
$result = imagepng($bgimg, $thumbPath);
break;
default: // 上边判断类型出错时会创建一张空白图，并给出扩展名为jpg
$result = imagejpeg($bgimg, $thumbPath);
}
if ($result)
{
$this->thumbPath = $thumbPath;
$this->path=$this->uploadFolder . '/' . $filename;
return $thumbPath;
}
else
{
$this->error = '缩略图创建失败';
$this->path=$this->uploadFolder . '/' . $filename;
return FALSE;
}
} // end thumb
// 说明：创建图片的存放目录
private function _mkdir()
{ // 创建图片上传目录和缩略图目录
if(!is_dir($this->uploadFolder))
{
$dir = explode('/', $this->uploadFolder);
foreach($dir as $v)
{
if($v)
{
$d .= $v . '/';
if(!is_dir($d))
{
$state = mkdir($d);
if(!$state)
{
$this->error = '在创建目录' . $d . '时出错！';
}
}
}
}
}
if(!is_dir($this->thumbFolder) && TRUE == $this->autoThumb)
{
$dir = explode('/', $this->thumbFolder);
foreach($dir as $v)
{
if($v)
{
$d .= $v . '/';
if(!is_dir($d))
{
$state = mkdir($d);
if(!$state)
{
$this->error = '在创建目录' . $d . '时出错！';
}
}
}
}
}
}
}
?>