How to modify the content of html file in php

How to modify the content of the html file in php: first make sure the file exists and is writable; then modify the html file through "if (fwrite($handle, $somecontent) === FALSE) {...}" Just the content.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php modify the content of the html file?

The code is as follows:

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