Easy way to get file extension in PHP

I use this code many times in my projects and now I share you this useful code. Sometimes in coding a very simple task can take you a lot of time to make a perfect solution. To get a file extension sometimes take me 30 mins to do the perfect code what work well in all of situation. But now it should take one minute with this code:

PHP Code:

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function get_file_extension($file_name) {
    return substr(strrchr($file_name,'.'),1);
} 


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This simple method of file extension retrieval should be reused throughout your code.

if $file has no extension, you get wrong variable values: $extension would be assigned with Simple example of pathinfo and array destructuring in PHP 7: