文件上传分为两个步骤
1，客户端用户上传；
a)需要一个表单域，用来注入要上传的文件，
<span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file"</span> <span>/></span>
b)用户选择所需要上传的文件
c)用户点击，将文件发送给服务器
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2，服务器接收
form表单使用POST提交方式。
*注意：GET，POST不能提交二进制文件，但是POST提交增加一个属性便可以完成。
<span><</span><span>form </span><span>action</span><span>="file.php"</span><span> method</span><span>="POST"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span>
html部分： DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>文件上传title> head> <body> <span><</span><span>form </span><span>action</span><span>="file.php"</span><span> method</span><span>="POST"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span> <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file"</span> <span>/></span> <input type="submit" value="提交"/> form> body>
var_dump($_FILES) 时发现得到的是一个数组
<span>array</span>
'file' =>
<span>array</span>
'name' => <span>string</span> '4.jpg' (length=5<span>)
</span>'type' => <span>string</span> 'image/jpeg' (length=10<span>)
</span>'tmp_name' => <span>string</span> 'F:\wamp\tmp\php904D.tmp' (length=23<span>)
</span>'error' => int 0
'size' => int 273665
a)根据二维数组找到error点；
<span>switch</span>(<span>$_FILES</span>['file']['error'<span>]){
</span><span>case</span> '0':
<span>echo</span> "上传成功"<span>;
</span><span>break</span><span>;
</span><span>case</span> '1':
<span>case</span> '2':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "文件大小超过服务器限制"<span>;
</span><span>break</span><span>;
</span><span>case</span> '3':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "文件只有部分上传成功"<span>;
</span><span>break</span><span>;
</span><span>case</span> '4':
<span>header</span>('Refresh:3;url=file.html'<span>);
</span><span>echo</span> "未选中文件，请重新选择文件并提交"<span>;
</span><span>break</span><span>;
</span><span>default</span>:
<span>echo</span> "文件上传失败"<span>;
}</span>
b)文件上传成功后，放到了指定的临时目录中，此时需要更改到期待的文件中，
php有一个函数可以完成，move_uploaded_file()
eg:
<span>move_uploaded_file</span>(<span>$_FILES</span>['file']['tmp_name'], './cy1/' . <span>$_FILES</span>['file']['name']);
注：tmp_name，文件上传到服务器的临时目录，
'name'，文件在客户端本地的文件名字。
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