What should I do if php tmp_name has no value?

php tmp_name has no value because it exceeds the size set by the system in php.ini. The solution is: first find the php.ini file; then modify the value of "upload_max_filesize".

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

What should I do if php tmp_name has no value? PHP file upload failed $_FILES tmp_name is empty?

When the PHP background is upgrading the App client, the files submitted through the form cannot be saved

After trying echo printing, it is determined to be echo $_FILES['app_file']['tmp_name']; Empty

There is no problem with the function of uploading pictures

Then print echo '
file error='.$_FILES['app_file']['error'] ;

file error=1

Cause

The file size exceeds the size set by the system in php.ini.

Then modify php.ini

upload_max_filesize = 20M

What is the difference between post_max_size and upload_max_filesize

One is the maximum value of uploaded files

One is the maximum value of data submitted through POST

Attachment

Common $_FILES system functions in the PHP programming language Usage:

$_FILES['myFile']['name'] 显示客户端文件的原名称。
$_FILES['myFile']['type'] 文件的 MIME 类型，例如"image/gif"。
$_FILES['myFile']['size'] 已上传文件的大小，单位为字节。
$_FILES['myFile']['tmp_name'] 储存的临时文件名，一般是系统默认。
$_FILES['myFile']['error'] 该文件上传相关的错误代码。

The following are the meanings of different codes:

0; 文件上传成功。
1; 超过了文件大小php.ini中即系统设定的大小。
2; 超过了文件大小
MAX_FILE_SIZE 选项指定的值。
3; 文件只有部分被上传。
4; 没有文件被上传。
5; 上传文件大小为0。

//

You need to set the following items in PHP.ini:

1. post_max_size =10M

The maximum data submitted by the form is 10M. This item does not limit the size of a single uploaded file, but limits the submitted data of the entire form.

The restriction range includes the form All content submitted. For example: when posting a post, the post title, content, attachments, etc...

2.file_uploads = On

Whether to allow file uploads, if it is OFF you will Unable to upload files.

3.upload_tmp_dir = "D:/APM/PHP/uploadtemp/"

The cache directory used by the system when uploading files. If there is insufficient disk space in this directory, you will Unable to upload files.

4.upload_max_filesize =2M

Maximum upload file size, this item is for the size of a single file when uploading files.

Recommended study: " PHP video tutorial》

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