php图片上传类，支持加水印，生成略缩图
分享一个网友写的php图片上传类，支持加水印，生成略缩图功能哦,面是配置和可以获取的一些信息（每一个配置信息都有默认值，如无特殊需要，可以不配置）：
<?php
/*----------------------------------------------------------------------------------
*
*----------------------------------------------------------------------------------
*/
class image_up {
//定义基本参数
private $uptype = array(
'image/jpg',
'image/jpeg',
'image/png',
'image/pjpeg',
'image/gif',
'image/bmp',
'image/x-png'
); //上传文件类型
private $max_file_size = 102400; //上传大小限制(单位:KB)
private $destination_folder = "up/"; //上传文件路径
private $watermark = 1; //是否附加水印
private $watertype = 1; //水印类型(1为文字,2为图片)
private $waterposition = 1; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
private $waterstring = null; //水印字符串
private $waterimg = null; //水印图片
private $imgpreview = 1; //是否生成预览图(1为生成,其他为不生成);
private $imgpreviewsize = 1; //预览图比例，0为按固定宽和高显示，其他为比例显示
private $imgwidth = 200; //预览图固定宽度
private $imgheight = 200; //预览图固定高度
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
private $imgthu = 1; //是否生成且保存略缩图,1为生成，0为不生成
private $imgthu_folder = null; //略缩图保存路径,默认与文件路径一致
private $imgthu_fixed = 0; //略缩图是否使用固定宽高，1为使用，0为灵活变动
private $imgthu_width = 200; //略缩图宽度
private $imgthu_height = 200; //略缩图高度
private $imgthu_name = null; //略缩图名称
//******************************************************************************************************************
private $inputname = "upfile"; //文件上传框名称
//******************************************************************************************************************
private $img_preview_display; //图片预览图显示
//******************************************************************************************************************
//文件上传相关信息，1为文件不存在，2为类型不符合，3为超出大小限制，4为上传失败，0为上传成功
private $file_up_info = null;
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//可在外部获取上传文件基本信息
private $file_name; //客服端文件的原名称
private $file_type; //文件的MIME类型
private $file_size; //已上传文件的大小，单位/字节
private $file_tmp_name; //储存的临时文件名
private $file_error; //该文件上传相关错误代码
private $img_size; //取得图片的长宽
private $file_basename; //获取带扩展名的全名
private $file_extension; //获取文件扩展名
private $filename; //文件名（不带扩展名)
private $destination; //问价路径加名称
//******************************************************************************************************************
public function __set($propety_name, $value) {
$this->$propety_name = $value;
}
public function __get($property_name) {
if (isset($this->$property_name)) return ($this->$property_name);
else return (NULL);
}
//******************************************************************************************************************
//定义文件上传功能
public function up() {
//判断文件是否存在
if (!is_uploaded_file($_FILES[$this->inputname]["tmp_name"])) {
$this->file_up_info = 1;
return;
}
//获取并赋值相应基本参数
$upfile = $_FILES[$this->inputname];
$this->file_name = $upfile["name"];
$this->file_type = $upfile["type"];
$this->file_size = $upfile["size"];
$this->file_tmp_name = $upfile["tmp_name"];
$this->file_error = $upfile["error"];
//检查文件类型是否符合
if (!in_array($this->file_type, $this->uptype)) {
$this->file_up_info = 2;
return;
}
//检查文件大小是否超出限制
if ($this->file_size > $this->max_file_size) {
$this->file_up_info = 3;
return;
}
//判断目录是否存在
if (!file_exists($this->destination_folder)) mkdir($this->destination_folder);
//进一步取得图片的信息并赋值
$this->img_size = getimagesize($this->file_tmp_name);
$pathinfo = pathinfo($this->file_name);
$this->file_extension = $pathinfo["extension"]; //获取文件扩展名
$this->file_basename = $pathinfo["basename"]; //获取带扩展名的全名
$this->filename = $pathinfo["filename"]; //文件名（不带扩展名)
$filename2 = $pathinfo['filename'];
$this->destination = $this->destination_folder . $this->filename . "." . $this->file_extension;
//判断文件名是否存在，如果存在则重命名
$n = 1;
while (file_exists($this->destination)) {
while (file_exists($this->destination)) {
$n++;
$this->filename = $this->filename . "(" . $n . ")";
$this->destination = $this->destination_folder . $this->filename . "." . $this->file_extension;
}
$this->filename = $filename2 . "(" . $n . ")";
$this->destination = $this->destination_folder . $this->filename . "." . $this->file_extension;
}
//移动上传的文件
if (move_uploaded_file($this->file_tmp_name, $this->destination)) $this->file_up_info = 0;
else $this->file_up_info = 4;
//添加水印
if ($this->watermark == 1) {
$this->imgthu();
}
//生成略缩图
if ($this->imgthu == 1) {
$this->add_watermark();
}
//生成预览图
if ($this->imgpreviewsize == 0) {
if ($this->img_size["0"] < $this->imgwidth) $this->imgwidth = $this->img_size["0"];
if ($this->img_size["1"] < $this->imgheight) $this->imgheight = $this->img_size["1"];
} else {
$this->imgwidth = $this->img_size["0"] * $this->imgpreviewsize;
$this->imgheight = $this->img_size["1"] * $this->imgpreviewsize;
}
$this->img_preview_display = "<img src='$this->destination' width='$this->imgwidth' height='$this->imgheight'
alt="图片预览：r文件名"：$this->file_tmp_name />";
}
//====================================================================================================================
//====================================================================================================================
//生成略缩图功能
function imgthu() {
if ($this->imgthu_folder == null) $this->imgthu_folder = $this->destination_folder;
//$this->imgthu_name=$this->filename."_t.".$this->file_extension;
$imgthu_name_b = $this->filename . "_t";
$imgthu_name_b2 = $this->filename . "_t";
$destination_b = $this->imgthu_folder . $imgthu_name_b . "." . $this->file_extension;
//判断文件名是否存在，如果存在则重命名
$n = 1;
while (file_exists($destination_b)) {
while (file_exists($destination_b)) {
$n++;
$imgthu_name_b = $imgthu_name_b . "(" . $n . ")";
$destination_b = $this->imgthu_folder . $imgthu_name_b . "." . $this->file_extension;
}
$imgthu_name_b = $imgthu_name_b2 . "(" . $n . ")";
$destination_b = $this->imgthu_folder . $imgthu_name_b . "." . $this->file_extension;
}
$imginfo = getimagesize($this->destination);
switch ($imginfo[2]) {
case 1:
$in = @imagecreatefromgif($this->destination);
break;
case 2:
$in = @imagecreatefromjpeg($this->destination);
break;
case 3:
$in = @imagecreatefrompng($this->destination);
break;
case 6:
$in = @imagecreatefrombmp($this->destination);
break;
default:
break;
}
//计算略缩图长宽
if ($this->imgthu_fixed == 0) {
if ($this->imgthu_height > ($imginfo[1] / $imginfo[0]) * $this->imgthu_width) $this->imgthu_width = ($imginfo[0] / $imginfo[1]) * $this->imgthu_height;
else $this->imgthu_height = ($imginfo[1] / $imginfo[0]) * $this->imgthu_width;
}
$new = imageCreateTrueColor($this->imgthu_width, $this->imgthu_height);
ImageCopyResized($new, $in, 0, 0, 0, 0, $this->imgthu_width, $this->imgthu_height, $imginfo[0], $imginfo[1]);
switch ($imginfo[2]) {
case 1:
imagejpeg($new, $destination_b);
break;
case 2:
imagejpeg($new, $destination_b);
break;
case 3:
imagepng($new, $destination_b);
break;
case 6:
imagewbmp($new, $destination_b);
break;
}
}
//====================================================================================================================
//====================================================================================================================
//添加水印功能
function add_watermark() {
//1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，
//8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。
$imginfo = getimagesize($this->destination);
$im = imagecreatetruecolor($this->img_size[0], $this->img_size[1]); //创建真彩色
$white = imagecolorallocate($im, 255, 255, 255); //设置颜色
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
//在 image 图像的坐标 x，y（图像左上角为 0, 0）处用 color 颜色执行区域填充（即与 x, y 点颜色相同且相邻的点都会被填充）。
imagefill($im, 0, 0, $white);
switch ($imginfo[2]) {
case 1:
$simage = imagecreatefromgif($this->destination); // 创建一个新的形象，从文件或 URL
break;
case 2:
$simage = imagecreatefromjpeg($this->destination);
break;
case 3:
$simage = imagecreatefrompng($this->destination);
break;
case 6:
$simage = imagecreatefromwbmp($this->destination);
break;
default:
echo ("不支持的文件类型");
break;
}
if (!empty($simage)) {
//位置设置
if ($this->watertype == 1) {
$str_len = strlen($this->waterstring);
$str_width = $str_len * 10;
$str_height = 20;
} elseif ($this->watertype == 1 && file_exists($this->waterimg)) {
$iinfo = getimagesize($this->waterimg);
$str_width = $iinfo[0];
$str_height = $iinfo[1];
}
switch ($this->waterposition) {
case 1:
$p_x = 5;
$p_y = $this->img_size[1] - $str_height;
break;
case 2:
$p_x = $this->img_size[0] - $str_width;
$p_y = $this->img_size[1] - $str_height;
break;
case 3:
$p_x = 5;
$p_y = 0;
break;
case 4:
$p_x = $this->img_size[0] - $str_width;
$p_y = 5;
break;
case 5:
$p_x = ($this->img_size[0] - $str_width) / 2;
$p_y = ($this->img_size[1] - $str_height) / 2;
break;
}
imagecopy($im, $simage, 0, 0, 0, 0, $this->img_size[0], $this->img_size[1]); //拷贝图像的一部分
//imagefilledrectangle($im,1,$this->img_size[1]-15,130,$this->img_size[1],$white); //将图片的封闭长方形区域着色
switch ($this->watertype) {
case 1: //加水印字符串
imagestring($im, 10, $p_x, $p_y, $this->waterstring, $red);
break;
case 2: //加水印图片
$simage1 = imagecreatefromgif($this->waterimg);
imagecopy($im, $simage1, 0, 0, 0, 0, 85, 15);
imagedestroy($simage1);
break;
}
switch ($imginfo[2]) {
case 1:
//imagegif($nimage, $destination);
imagejpeg($im, $this->destination);
break;
case 2:
imagejpeg($im, $this->destination);
break;
case 3:
imagepng($im, $this->destination);
break;
case 6:
imagewbmp($im, $this->destination);
break;
}
//覆盖原上传文件
imagedestroy($im);
imagedestroy($simage);
}
}
}
?>教程地址：http://www.phprm.com/frame/php1005250.html
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