有好多种方法，今天给大家提供一个简单的方法。
使用说明:
1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
2. 将extension_dir =改为你的php_gd2.dll所在目录;
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<?php
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/***
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参数说明:
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$max_file_size : 上传文件大小限制, 单位BYTE
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$destination_folder : 上传文件路径
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$watermark : 是否附加水印(1为加水印,其他为不加水印);
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@site
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*******/
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//上传文件类型列表
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$uptypes=array(
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'image/jpg',
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'image/jpeg',
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'image/png',
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'image/pjpeg',
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'image/gif',
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'image/bmp',
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'image/x-png'
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);
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$max_file_size=2000000; //上传文件大小限制, 单位BYTE
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$destination_folder="uploadimg/"; //上传文件路径
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$watermark=1; //是否附加水印(1为加水印,其他为不加水印);
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$watertype=1; //水印类型(1为文字,2为图片)
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$waterposition=1; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
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$waterstring=""; //水印字符串
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$waterimg="xplore.gif"; //水印图片
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$imgpreview=1; //是否生成预览图(1为生成,其他为不生成);
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$imgpreviewsize=1/2; //缩略图比例
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?>
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<html>
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<head>
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<title>ZwelL图片上传程序 - www.jbxue.com </title>
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<style type="text/css">
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</style>
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</head>
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<body>
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<form enctype="multipart/form-data" method="post" name="upform">
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上传文件:
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<input name="upfile" type="file">
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<input type="submit" value="上传"><br>
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允许上传的文件类型为:<?=implode(', ',$uptypes)?>
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</form>
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<?php
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if ($_SERVER['REQUEST_METHOD'] == 'POST')
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{
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if (!is_uploaded_file($_FILES["upfile"][tmp_name]))
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//是否存在文件
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{
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echo "图片不存在!";
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exit;
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}
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$file = $_FILES["upfile"];
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if($max_file_size < $file["size"])
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//检查文件大小
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{
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echo "文件太大!";
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exit;
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}
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if(!in_array($file["type"], $uptypes))
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//检查文件类型
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{
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echo "文件类型不符!".$file["type"];
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exit;
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}
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if(!file_exists($destination_folder))
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{
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mkdir($destination_folder);
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}
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$filename=$file["tmp_name"];
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$image_size = getimagesize($filename);
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$pinfo=pathinfo($file["name"]);
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$ftype=$pinfo['extension'];
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$destination = $destination_folder.time().".".$ftype;
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if (file_exists($destination) && $overwrite != true)
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{
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echo "同名文件已经存在了";
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exit;
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}
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if(!move_uploaded_file ($filename, $destination))
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{
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echo "移动文件出错";
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exit;
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}
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$pinfo=pathinfo($destination);
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$fname=$pinfo[basename];
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echo " 已经成功上传
文件名: ".$destination_folder.$fname."
";
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echo " 宽度:".$image_size[0];
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echo " 长度:".$image_size[1];
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echo "
大小:".$file["size"]." bytes";
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if($watermark==1)
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{
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$iinfo=getimagesize($destination,$iinfo);
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$nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
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$white=imagecolorallocate($nimage,255,255,255);
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$black=imagecolorallocate($nimage,0,0,0);
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$red=imagecolorallocate($nimage,255,0,0);
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imagefill($nimage,0,0,$white);
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switch ($iinfo[2])
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{
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case 1:
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$simage =imagecreatefromgif($destination);
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break;
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case 2:
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$simage =imagecreatefromjpeg($destination);
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break;
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case 3:
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$simage =imagecreatefrompng($destination);
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break;
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case 6:
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$simage =imagecreatefromwbmp($destination);
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break;
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default:
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die("不支持的文件类型");
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exit;
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}
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imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
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imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);
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switch($watertype)
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{
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case 1: //加水印字符串
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imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
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break;
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case 2: //加水印图片
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$simage1 =imagecreatefromgif("xplore.gif");
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imagecopy($nimage,$simage1,0,0,0,0,85,15);
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imagedestroy($simage1);
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break;
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}
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switch ($iinfo[2])
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{
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case 1:
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//imagegif($nimage, $destination);
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imagejpeg($nimage, $destination);
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break;
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case 2:
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imagejpeg($nimage, $destination);
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break;
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case 3:
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imagepng($nimage, $destination);
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break;
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case 6:
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imagewbmp($nimage, $destination);
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//imagejpeg($nimage, $destination);
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break;
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}
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//覆盖原上传文件
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imagedestroy($nimage);
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imagedestroy($simage);
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}
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if($imgpreview==1)
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{
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echo "
图片预览:
";
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echo "
![](\""</span)
.$destination."\" width=".($image_size[0]*$imgpreviewsize)." height=".($image_size[1]*$imgpreviewsize);
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echo " alt=\"图片预览:\r文件名:".$destination."\r上传时间:\">";
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}
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}
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?>
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</body>
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</html>
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