WordPress attachment upload size limit

Modify PHP. ini

Post_max_size = 8 m

Upload_max_filesize = 2 m

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If the file size is much larger than the server-side limit (upload_max_filesize,

But it is still not reached or close to post_max_size or memory_limit,
$ _ Files will "crash" -- the result is that $ _ FILES ['userfile'] is changed to "undefined Index"

For details, refer to [PHP. ini core configuration options] in the PHP manual 〕
The maximum size of the File Uploaded By upload_max_filesize.
Post_max_size: set the maximum size allowed by post data.
Memory_limit specifies the maximum number of memory bytes that a script can apply.

Generally, memory_limit> post_max_size> upload_max_filesize