Question Detial

Difference between Require and Require_once, Include and Include_once, and Require and Include.

REQUIRE()

• The file should exist.Otherwise it will produce an Fatal error.the program cannot continue.
  
• Can call same file more than once.

REQUIRE_ONCE()

• Missing file throws Fatal Error and stops script.
• Cannot call same file more than once.

INCLUDE()

• Missing file throws Warning and keeps going.
• Can call same file more than once.
• The file is not mandatory.
• The program will run even if there is no such a file producing a warning.
  

INCLUDE_ONCE()

• Missing file throws Warning and keeps going.
• Cannot call same file more than once.