How to create a function to check if code returns expected output?

• PHPUnit

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  The PHP Unit Testing framework.

What they are asking you is to cover your code with unit tests. A good framework for PHP is PHPUnit (https://phpunit.de/). It's a more complicated topic than what I can cover in a reddit comment, but essentially, you will write your operating code in one class, then a test in a separate class and make assertions as to what you're expecting to happen. Your test class will execute your operating code and then compare whether the assertions you told it to expect matches.

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