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：
代码示例:
<?php /* * 参数说明 * $max_file_size : 上传文件大小限制, 单位BYTE * $destination_folder : 上传文件路径 * $watermark : 是否附加水印(1为加水印,其他为不加水印); * http://www.imooc.com * 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; */ // 上传文件类型列表 $uptypes = array ( 'image/jpg', 'image/png', 'image/jpeg', 'image/pjpeg', 'image/gif', 'image/bmp', 'image/x-png' ); $max_file_size = 20000000; //上传文件大小限制，单位BYTE $destination_folder = 'uploadimg/'; //上传文件路径 $watermark = 1; //是否附加水印(1为加水印,其他为不加水印); $watertype = 1; //水印类型(1为文字,2为图片) $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); $waterstring = "http://www.jbxue.com/"; //水印字符串 $waterimg = "xplore.gif"; //水印图片 $imgpreview = 1; //是否生成预览图(1为生成,其他为不生成); $imgpreviewsize = 1 / 2; //缩略图比例 ?>
<html> <head> <title>ZwelL图片上传程序</title> </head> <body> <form id="upfile" name="upform" enctype="multipart/form-data" method="post" action=""> <label for="upfile">上传文件：</label> <input type="file" name="upfile" id="fileField" /> <input type="submit" name="submit" value="上传"/> </form> </body> </html>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
//判断是否有上传文件
if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {
$upfile = $_FILES['upfile'];
print_r($_FILES['upfile']);
$name = $upfilep['name']; //文件名
$type = $upfile['type']; //文件类型
$size = $upfile['size']; //文件大小
$tmp_name = $upfile['tmp_name']; //临时文件
$error = $upfile['error']; //出错原因
if ($max_file_size < $size) { //判断文件的大小
echo '上传文件太大';
exit ();
}
if (!in_arrar($type, $uptypes)) { //判断文件的类型
echo '上传文件类型不符' . $type;
exit ();
}
if (!file_exists($destination_folder)) {
mkdir($destination_folder);
}
if (file_exists("upload/" . $_FILES["file"]["name"])) {
echo $_FILES["file"]["name"] . " already exists. ";
} else {
move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]);
echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
}
$pinfo = pathinfo($name);
$ftype = $pinfo['extension'];
$destination = $destination_folder . time() . "." . $ftype;
if (file_exists($destination) && $overwrite != true) {
echo "同名的文件已经存在了";
exit ();
}
if (!move_uploaded_file($tmp_name, $destination)) {
echo "移动文件出错";
exit ();
}
$pinfo = pathinfo($destination);
$fname = $pinfo[basename];
echo " <font color=red>已经成功上传</font><br>文件名: <font color=blue>" . $destination_folder . $fname . "</font><br>";
echo " 宽度:" . $image_size[0];
echo " 长度:" . $image_size[1];
echo "<br> 大小:" . $file["size"] . " bytes";
if ($watermark == 1) {
$iinfo = getimagesize($destination, $iinfo);
$nimage = imagecreatetruecolor($image_size[0], $image_size[1]);
$white = imagecolorallocate($nimage, 255, 255, 255);
$black = imagecolorallocate($nimage, 0, 0, 0);
$red = imagecolorallocate($nimage, 255, 0, 0);
imagefill($nimage, 0, 0, $white);
switch ($iinfo[2]) {
case 1 :
$simage = imagecreatefromgif($destination);
break;
case 2 :
$simage = imagecreatefromjpeg($destination);
break;
case 3 :
$simage = imagecreatefrompng($destination);
break;
case 6 :
$simage = imagecreatefromwbmp($destination);
break;
default :
die("不支持的文件类型");
exit;
}
imagecopy($nimage, $simage, 0, 0, 0, 0, $image_size[0], $image_size[1]);
imagefilledrectangle($nimage, 1, $image_size[1] - 15, 80, $image_size[1], $white);
switch ($watertype) {
case 1 : //加水印字符串
imagestring($nimage, 2, 3, $image_size[1] - 15, $waterstring, $black);
break;
case 2 : //加水印图片
$simage1 = imagecreatefromgif("xplore.gif");
imagecopy($nimage, $simage1, 0, 0, 0, 0, 85, 15);
imagedestroy($simage1);
break;
}
switch ($iinfo[2]) {
case 1 :
//imagegif($nimage, $destination);
imagejpeg($nimage, $destination);
break;
case 2 :
imagejpeg($nimage, $destination);
break;
case 3 :
imagepng($nimage, $destination);
break;
case 6 :
imagewbmp($nimage, $destination);
//imagejpeg($nimage, $destination);
break;
}
//覆盖原上传文件
imagedestroy($nimage);
imagedestroy($simage);
}
if ($imgpreview == 1) {
echo "<br>图片预览:<br>";
echo "<img src=\"" . $destination . "\" width=" . ($image_size[0] * $imgpreviewsize) . " height=" . ($image_size[1] * $imgpreviewsize);
echo " alt=\"图片预览:\r文件名:" . $destination . "\r上传时间:\">";
}
}
}
?>