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php 上传图片的代码，很简单，实现了基本的文件类型、文件大小的检测，并实现了基本的水印与缩略功能，比较适合初学的朋友参考。
上传页面与处理页面合二为一了，文件名为test_upload_pic.php，完整代码如下：
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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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* $watermark : 是否附加水印(1为加水印,其他为不加水印);
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*
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* 使用说明:
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* 1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
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* 2. 将extension_dir =改为你的php_gd2.dll所在目录;
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*/
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// 上传文件类型列表
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$uptypes = array (
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'image/jpg',
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'image/png',
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'image/jpeg',
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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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$max_file_size = 20000000; //上传文件大小限制，单位BYTE
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$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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$imgpreviewsize = 1 / 2; //缩略图比例
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?>
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<html>
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<head>
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<title>ZwelL图片上传程序</title>
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</head>
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<body>
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<form id="upfile" name="upform" enctype="multipart/form-data" method="post" action="">
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<label for="upfile">上传文件：</label>
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<input type="file" name="upfile" id="fileField" />
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<input type="submit" name="submit" value="上传"/>
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</form>
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</body></html>
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<?php
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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//判断是否有上传文件
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if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {
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$upfile = $_FILES['upfile'];
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print_r($_FILES['upfile']);
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$name = $upfilep['name']; //文件名
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$type = $upfile['type']; //文件类型
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$size = $upfile['size']; //文件大小
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$tmp_name = $upfile['tmp_name']; //临时文件
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$error = $upfile['error']; //出错原因
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if ($max_file_size < $size) { //判断文件的大小
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echo '上传文件太大';
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exit ();
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}
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if (!in_arrar($type, $uptypes)) { //判断文件的类型
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echo '上传文件类型不符' . $type;
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exit ();
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}
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if (!file_exists($destination_folder)) {
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mkdir($destination_folder);
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}
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if (file_exists("upload/" . $_FILES["file"]["name"])) {
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echo $_FILES["file"]["name"] . " already exists. ";
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} else {
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move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]);
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echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
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}
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$pinfo = pathinfo($name);
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$ftype = $pinfo['extension'];
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$destination = $destination_folder . time() . "." . $ftype;
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if (file_exists($destination) && $overwrite != true) {
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echo "同名的文件已经存在了";
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exit ();
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}
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if (!move_uploaded_file($tmp_name, $destination)) {
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echo "移动文件出错";
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exit ();
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}
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$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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$iinfo = getimagesize($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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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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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 ($iinfo[2]) {
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case 1 :
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//imagegif($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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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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?>
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</body>
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</html>
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