https://softwareengineering.stackexchange.com/questions/404221/understanding-the-scope-resolution-operator-in-php-language

https://softwareengineering.stackexchange.com/q/432605/106313

To-Do on Quora:

• http://programmers.stackexchange.com/questions/272889/understanding-the-solution-of-exercise-1-12-of-krs-book-as-given-in-the-book
• http://programmers.stackexchange.com/questions/273207/understanding-the-solution-of-exercise-1-16-of-kr-as-given-in-the-the-c-answer
• http://programmers.stackexchange.com/questions/270834/understanding-the-concept-of-arguments-and-parameters-in-c-language-as-expla

To study:

• http://programmers.stackexchange.com/questions/273207/understanding-the-solution-of-exercise-1-16-of-kr-as-given-in-the-the-c-answer

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• To-Do on quora:

http://codereview.stackexchange.com/questions/87751/understanding-the-solution-of-exercise-1-12-of-krs-book-as-given-in-the-book/87756#87756