In Codeigniter what is the purpose of hook ? Why we have to create?

Question

i am new to codeigniter. In Every interview all asked about hooks. i am not getting that what is hook why i have to use it ? what the benefit of it.

Answer

This is example link for use it hooks in codeigniter

https://qasimbadami.wordpress.com/2012/05/18/codeigniter-hooks-tutorial/

Note : suppose you have big project and almost 100 controller , if every time to check session exists or not , each and every post request so than to use hook

Accepted Answer

This is example link  for use it hooks in codeigniterhttps://qasimbadami.wordpress.com/2012/05/18/codeigniter-hooks-tutorial/Note : suppose you have big project and almost 100 controller , if every time to check session exists or not , each and every post request so than to use hook

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Answer