http://www.tizag.com/phpT/fileupload.php

要在FORM加上enctype="multipart/form-data"

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php - file upload: html form

Before you can use PHP to manage your uploads, you must first build an HTML form that lets users select a file to upload. See our HTML Form lesson for a more in-depth look at forms.

<form enctype="multipart/form-data" action="uploader.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
Choose a file to upload: <input name="uploadedfile" type="file" /><br />
<input type="submit" value="Upload File" />
</form>

Here is a brief description of the important parts of the above code:

• enctype="multipart/form-data" - Necessary for our to-be-created PHP file to function properly.
• action="uploader.php" - The name of our PHP page that will be created, shortly.
• method="POST" - Informs the browser that we want to send information to the server using POST.
• input type="hidden" name="MA... - Sets the maximum allowable file size, in bytes, that can be uploaded. This safety mechanism is easily bypassed and we will show a solid backup solution in PHP. We have set the max file size to 100KB in this example.
• input name="uploadedfile" - uploadedfile is how we will access the file in our PHP script.

Save that form code into a file and call it upload.html. If you view it in a browser it should look like this:

Display:

After the user clicks submit, the data will be posted to the server and the user will be redirected to uploader.php. This PHP file is going to process the form data and do all the work.

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