转自：

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：

复制代码代码示例:

<?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.jbxue.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 (
'p_w_picpath/jpg',
'p_w_picpath/png',
'p_w_picpath/jpeg',
'p_w_picpath/pjpeg',
'p_w_picpath/gif',
'p_w_picpath/bmp',
'p_w_picpath/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:" . $p_w_picpath_size[0];
echo " 长度:" . $p_w_picpath_size[1];
echo "<br> 大小:" . $file["size"] . " bytes";

if ($watermark == 1) {

$iinfo = getp_w_picpathsize($destination, $iinfo);
$np_w_picpath = p_w_picpathcreatetruecolor($p_w_picpath_size[0], $p_w_picpath_size[1]);
$white = p_w_picpathcolorallocate($np_w_picpath, 255, 255, 255);
$black = p_w_picpathcolorallocate($np_w_picpath, 0, 0, 0);
$red = p_w_picpathcolorallocate($np_w_picpath, 255, 0, 0);
p_w_picpathfill($np_w_picpath, 0, 0, $white);
switch ($iinfo[2]) {
case 1 :
$sp_w_picpath = p_w_picpathcreatefromgif($destination);
break;
case 2 :
$sp_w_picpath = p_w_picpathcreatefromjpeg($destination);
break;
case 3 :
$sp_w_picpath = p_w_picpathcreatefrompng($destination);
break;
case 6 :
$sp_w_picpath = p_w_picpathcreatefromwbmp($destination);
break;
default :
die("不支持的文件类型");
exit;
}

p_w_picpathcopy($np_w_picpath, $sp_w_picpath, 0, 0, 0, 0, $p_w_picpath_size[0], $p_w_picpath_size[1]);

p_w_picpathfilledrectangle($np_w_picpath, 1, $p_w_picpath_size[1] - 15, 80, $p_w_picpath_size[1], $white);

switch ($watertype) {

case 1 : //加水印字符串

p_w_picpathstring($np_w_picpath, 2, 3, $p_w_picpath_size[1] - 15, $waterstring, $black);

break;
case 2 : //加水印图片

$sp_w_picpath1 = p_w_picpathcreatefromgif("xplore.gif");

p_w_picpathcopy($np_w_picpath, $sp_w_picpath1, 0, 0, 0, 0, 85, 15);
p_w_picpathdestroy($sp_w_picpath1);
break;
}

switch ($iinfo[2]) {

case 1 :
//p_w_picpathgif($np_w_picpath, $destination);

p_w_picpathjpeg($np_w_picpath, $destination);

break;
case 2 :
p_w_picpathjpeg($np_w_picpath, $destination);
break;
case 3 :
p_w_picpathpng($np_w_picpath, $destination);
break;
case 6 :
p_w_picpathwbmp($np_w_picpath, $destination);
//p_w_picpathjpeg($np_w_picpath, $destination);
break;
}

//覆盖原上传文件

p_w_picpathdestroy($np_w_picpath);
p_w_picpathdestroy($sp_w_picpath);
}

if ($imgpreview == 1) {

echo "<br>图片预览:<br>";
echo "<img src=\"" . $destination . "\" width=" . ($p_w_picpath_size[0] * $imgpreviewsize) . " height=" . ($p_w_picpath_size[1] * $imgpreviewsize);
echo " alt=\"图片预览:\r文件名:" . $destination . "\r上传时间:\">";
}
}
}
?>
</body>
</html>

您可能感兴趣的文章：