About the size of the downstream file,

For more information about the size of uploaded files! When the size of the uploaded file is larger than the value limited by the upload_max_filesize option in php. ini, will the program not run? In php. ini, the value of upload_max_filesize is set to 2 MB, and the size of the uploaded file cannot be greater than 2 MB. submit a form to ask about the size of the uploaded file!
When the size of the uploaded file is larger than the value limited by the upload_max_filesize option in php. ini, will the program not run?

The value of upload_max_filesize I set in php. ini is 2 M,

The size of the uploaded file cannot be greater than 2 MB,

After the form is submitted, the file size is determined in the background. if the size is greater than 2 MB, an error is Prompted. otherwise, no error is prompted.

However, when uploading a file, I directly uploaded a 3 M file, and the program did not respond,

What is the reaction of the program when the size of the uploaded file is larger than the value of upload_max_filesize in php. ini?

How can I get this error and prompt the user?

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Didn't you say you gave a judgment?
In addition, it cannot exceed the size of post_max_size. Generally, upload_max_filesize <= post_max_size
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Determine the size of the uploaded FILE, $ _ FILE ['name'] ['size']
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2 MB = 2097152B
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Give it a try and explain the result.