php表单提交--文件
创建一个文件上传表单
允许用户从表单上传文件是非常有用的。
请看下面这个供上传文件的 HTML 表单：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1>表单文件的上传（小于2MB）</h1>
<form action="phpfilewrite.php" method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" />
<br />
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>
请留意如下有关此表单的信息：
<form> 标签的 enctype 属性规定了在提交表单时要使用哪种内容类型。在表单需要二进制数据时，比如文件内容，请使用 "multipart/form-data"。
<input> 标签的 type="file" 属性规定了应该把输入作为文件来处理。举例来说，当在浏览器中预览时，会看到输入框旁边有一个浏览按钮。
注释：允许用户上传文件是一个巨大的安全风险。请仅仅允许可信的用户执行文件上传操作。
创建上传脚本 v1.0
"upload_file.php" 文件含有供上传文件的代码：
<?php
if ($_FILES["file"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "<br />";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Stored in: " . $_FILES["file"]["tmp_name"];
}
?>
通过使用 PHP 的全局数组 $_FILES，你可以从客户计算机向远程服务器上传文件。
第一个参数是表单的 input name，第二个下标可以是 "name", "type", "size", "tmp_name" 或 "error"。就像这样：
- $_FILES["file"]["name"] - 被上传文件的名称
- $_FILES["file"]["type"] - 被上传文件的类型
- $_FILES["file"]["size"] - 被上传文件的大小，以字节计
- $_FILES["file"]["tmp_name"] - 存储在服务器的文件的临时副本的名称
- $_FILES["file"]["error"] - 由文件上传导致的错误代码
这是一种非常简单文件上传方式。基于安全方面的考虑，应当增加有关什么用户有权上传文件的限制。
上传限制 v2.0
在这个脚本中，我们增加了对文件上传的限制。用户只能上传 .gif 或 .jpeg 文件，文件大小必须小于 2MB：
<?php if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 2000000))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "<br />";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Stored in: " . $_FILES["file"]["tmp_name"];
}
}
else
{
echo "Invalid file";
} ?>
注释：对于 IE，识别 jpg 文件的类型必须是 pjpeg，对于 FireFox，必须是 jpeg。
保存被上传的文件 v3.0
上面的例子在服务器的 PHP 临时文件夹创建了一个被上传文件的临时副本。
这个临时的复制文件会在脚本结束时消失。要保存被上传的文件，我们需要把它拷贝到另外的位置：
<?php
header("Content-type: text/html; charset=utf-8");
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 2000000))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />"; if (file_exists("upload/" . $_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " 文件已经存在 ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
}
}
}
else
{
echo "文件格式不正确，或是文件过大";
}
?>
上面的脚本检测了是否已存在此文件，如果不存在，则把文件拷贝到指定的文件夹。
注释：这个例子把文件保存到了名为 "upload" 的新文件夹。需要你在php文件的当前目录下，创建一个叫做upload的文件夹，否则会报错
演示图片
html界面
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" alt="" />
上传成功页面
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文件已经存在：
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