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PHP implements uploading files to temporary directory

王林

Feb 14, 2020 pm 06:20 PM

php

PHP implements uploading files to temporary directory

Implemented through the

form, the file is uploaded to a temporary directory. We do not need to control the upload process. We only need to move the file to the directory we desire.

The specific method is as follows:

1. Modify the PHP configuration file

file_uploads//服务器上的PHP脚本是否可以接受HTTP文件上传
 
memory_limit//设置脚本可以分配的最大内存量，防止失控脚本独占服务器内存
 
upload_max_filesize//限制PHP处理上传文件的最大值，此值必须小于post_max_size值
 
 post_max_size//限制通过POST方法可以接受的信息最大量
 
upload_tmp_dir //上传文件存放的临时路径，可以是绝对路径。这个目录对于拥有此服务器进程用户必须是可写的。

Note: Restart the server after modifying the configuration file.

(Related learning video sharing: php video tutorial)

2. $_FILES multi-dimensional array, used to store various upload-related information

$_FILES[‘file’][‘name’]    　　　　//客户端上传的文件原名称，含扩展名
$_FILES[‘file’][‘size’]      　　　　//已上传文件的大小，单位为字节
$_FILES[‘file][‘tmp_name’]    　   //文件上传后，在服务器端存储的临时文件名
$_FILES[‘file][‘error’]      　　　　//文件上传时产生的错误
                             　　　　　　　　0：文件上传成功
                             　　　　　　　　1：上传文件的大小超出了在PHP配置文件中upload_max_filesize选项限制的值
                             　　　　　　　　2：上传文件大小超出了HTML表单中MAX_FILE_SIZE选项指定的值
                           　　　　　　　　  3：文件只被部分上传
                             　　　　　　　　4：没有上传任何文件
$_FILES[‘file’][‘type’]   　　　　 //上传文件的类型，每种MIME类型由‘/’分隔主类型和子类型组成

3. PHP file upload processing function

is_uploaded_file()　　　　　　//判断指定的文件是否通过HTTP POST上传的
move_uploaded_file()　　　　//文件上传后先存储于服务器的临时目录中，使用该函数移动文件位置

Example:

<?php
    header(&#39;Content-type:text/html;charset=utf-8&#39;);
    //判断客户端是否有提交动作
    if(isset($_POST[&#39;submit&#39;])){
        //判断文件是否通过HTTP POST上传的
        if(is_uploaded_file($_FILES[&#39;myfile&#39;][&#39;tmp_name&#39;])){
            //用于服务器端显示客户端上传文件的后缀名.返回值是一个数组
            $arr=pathinfo($_FILES[&#39;myfile&#39;][&#39;name&#39;]);
            //以年 月 日的格式命名客户端上传的文件名并随机产生一个数,避免名字相同
            $newName=date(&#39;YmdGis&#39;).rand(1000,99999);
            if(move_uploaded_file($_FILES[&#39;myfile&#39;][&#39;tmp_name&#39;],"C:/123/{$newName}.{$arr[&#39;extension&#39;]}")){
                echo &#39;成功&#39;;
            }else{
                echo &#39;失败&#39;;
            }
        }else{
            exit(&#39;....&#39;);
        }
    }
    var_dump($_FILES);
?>
<DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文件上传</title>
</head>
<body>
    <form method="post" action="" enctype="multipart/form-data">
    <input type="file" name="myfile"/>
    <input type="submit" name="submit" value="开始上传"/>
    </form>
</body>
</html>

The result is as shown in the figure:

PHP implements uploading files to temporary directory

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