Submitted code-after the updated PHP code submission server, browser access has not changed

The server has submitted code that PHP cannot access the updated file

Server with linux+nginx+mysql+php, write native PHP, not in MVC mode, as far as the code is OK I have tested it before. But I changed the HTML in the code to the width of a div, placed on the server, but the browser to access the page, the width of the div did not change, I refreshed several times the page is useless. I look under Ubuntu code code is updated, the width is changed. The previous PHP file was also replaced by my modified PHP file. Why did I visit the page, load or modify the PHP file before? In addition I this code in the local WAMP environment test is able to display normally and the width has changed. Besides, I had no problem with the test when I first went to work this afternoon. That's when I changed the width. PHP Novice, ask the big God answer. Thank you, sir.

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