Submitted the code - after the updated php code was submitted to the server, the browser access remained unchanged.

The server submitted the code and php could not access the updated file

The server uses linux+nginx+mysql+php, written in native php, and does not use mvc mode. As for the code, I have tested it before. But I changed the width of a div in the HTML in the code and put it on the server. However, when the browser accessed the page, the width of the div did not change. I refreshed the web page several times to no avail. I checked the code under Ubuntu. The code has been updated and the width has been changed. The previous php file was also replaced by the php file I changed. Why does the page I visit load the php file before modification? In addition, my code can be displayed normally when tested in the local wamp environment and the width has been changed. In addition, when I first went to work in the afternoon, the test was fine. It suddenly happened after I changed the width. I am new to php, please give me some advice. Thank you.

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