INTERVIEW QUESTIONS PROGRAMMING LANGUAGES PHP DETAILS

Question: What is difference between require_once(), require(), include().
Becouse above three function usely use to call a file in another file.

Answer: Difference between require() and require_once(): require() includes and evaluates a specific file, while require_once() does that only if it has not been included before (on the same page).
So, require_once() is recommended to use when you want to include a file where you have a lot of functions for example. This way you make sure you don't include the file more times and you will not get the "function re-declared" error.

Difference between require() and include() is that require() produces a FATAL ERROR if the file you want to include is not found, while include() only produces a WARNING.

There is also include_once() which is the same as include(), but the difference between them is the same as the difference between require() and require_once().

Difference between require() and require_once(): require() includes and evaluates a specific file, while require_once() does that only if it has not been included before (on the same page).
So, require_once() is recommended to use when you want to include a file where you have a lot of functions for example. This way you make sure you don't include the file more times and you will not get the "function re-declared" error.

Difference between require() and include() is that require() produces a FATAL ERROR if the file you want to include is not found, while include() only produces a WARNING.

There is also include_once() which is the same as include(), but the difference between them is the same as the difference between require() and require_once().
Source: CoolInterview.com

There is also include_once() which is the same as include(), but the difference between them is the same as the difference between require() and require_once(). Source: CoolInterview.com

require() stop the further execution of the program as soon as it encounters and error.

include() continues the execution of the program until the last statement even when it encounters a error in between. Source: CoolInterview.com

include()
---------
It includes a spcified file.
It will produce a a warning if it fail to find the file and execute the remaining scripts

require
-----------
It includes a spcified file.
It will produce a a fatal error if it fail to find the file and stops the ececution


include_once()
-------------------
It includes a spcified file.
a file has already been included, it will not be included again.
It will produce a a warning if it fail to find yhe file and execute the remaining scripts.

require_once()
-----------
It includes a spcified file.
a file has already been included, it will not be included again.
It will produce a a fatal error if it fail to find the file and stops the ececution Source: CoolInterview.com

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