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This article is about how to solve the problem that php cannot receive file. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Php can not receive file solutions: 1, find the php.ini configuration file; 2, configure "upload_max_filesize = 30m" content; 3, modify the post_max_size option.

This article operating environment: windows7 system, PHP7.1 version, Dell G3 computer.

Common reasons why php can't get $_ file

Today, there was a strange problem when uploading the for form. The form submission could not be obtained, even the ordinary fields could not be obtained. Because I uploaded the file, I went to see if the for form added the enctype= "multipart/form-data" attribute, and found that it had also been added.

Later, when I went to php.ini to open the file upload function, file_uploads=on found that it was also turned on. After a long time of meditation and debugging, it still didn't work. After thinking that another project I did was also uploading pictures, I could get the data, so I took a look at it and found that there was no difference in the code. It still didn't work here. After that, I went to php.ini to see if there was anything wrong with the configuration. I saw that upload_max_filesize = 2m (that is, the file upload size is 2m) because I uploaded more than 2m files, I changed upload_max_filesize = 2m to upload_max_filesize = 64m, restarted the server, and found that it still didn't work. Later, I thought about whether there was a limit when the form was submitted, and post_max_size=8M was found in the interesting php.ini. (it represents the maximum byte length of POST data, which defaults to 8m.) Change it to post_max_size=64M, restart the service, and find it's OK.

Summary:

The default file upload size in the php.ini configuration file is 2m, and the default upload_max_filesize = 2m, that is, the file upload size is 2m. If you want to upload more than 8m files, such as 30m, you must configure upload_max_filesize = 30m.

However, just setting upload_max_filesize = 30m still can not achieve file upload function, you must modify the post_max_size option in the php.ini configuration file, which represents the maximum byte length of POST data, which defaults to 8m, so set post_max_size=30M.

If the POST data exceeds the limit, $_ POST and $_ FILES will be empty. To upload a large file, you must set this option to be greater than or equal to the value of the upload_max_filesize command.

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