PHP Class not found

Question

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The first time I used PHP, I pulled down a project (project address) from github. I created a new index.php, and then wrote the code in the picture. Why do I keep getting errors?
Do you think the path is OK?

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Answer 1

You wrote it yourselfindex.php，需要引入vender的autoload.php.
If you use a framework, the framework itself has already implemented the class automatic loading and registration mechanism.

Answer 2

https://getcomposer.org/
http://www.phpcomposer.com/

Look at the composer's documentation. vendor is the composer's library directory. If you want to use it directly, you can use a relative directory reference.
General use should be to introduce the autoload.php file in the vendor directory outside the vendor directory

Answer 3

The autoloading function is not registered and the class is not loaded

Answer 4

Quick fix by referencing the namespace at the top of the page