The first piece of code is written incorrectly and the problem cannot be found?

Question

Create a new file, C:\phpStudy\PHPTutorial\WWW. Create abc.php in this, and create a new www folder under C:\phpStudy, and then create abc.php. Both methods cannot open the web page. http://www.php.cn/abc.php When opening the website, it prompts No input file specified. What is the reason?