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This article mainly shows you "PHP how to achieve coverage operation", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to achieve coverage operation in PHP" this article.

PHP overlay (Overwriting)

If "newfile.txt" now contains some data, we can show what happens when we write to an existing file. All existing data is erased and starts with a new file.

In the following example, we open an existing file "newfile.txt" and write some new data to it:

Example

If we open this "newfile.txt" file now, both Bill and Steve have disappeared, leaving only the data we just wrote:

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