include is optinal and you have to have required things.
include will continue executing the script even with errors while require will produce a fatal error and stop the script. Note: if you put include/require 'grandpa.php' in 'father.php' and then include 'father.php' in 'son.php' and also put include/require 'grandpa.php' in 'son.php' then both require & include will produce errors. Best thing to add is include_once or require_once in your code as it will only add the file once and will override other include_once or require_once
Require usually means always require. Require once refers to a one time requirement that is waived for future events.
An opcode is an instruction. An operand is information used by the opcode. Not all opcodes require operands.
The difference between intervals and segment is that intervals include the waves,and segments don't.
They're completely identical except how they output errors. Include produces a warning, while Require produces a fatal error.
Law require a politician. Morals only require, at the least, an elementary sense of right and wrong/good and evil.
The two functions are used to insert the content of a file into another PHP file before it is executed by the server. They are identical in every aspect, but they perform error handling in different ways. The include() function generates a warning (which does not halt execution) while the require() function generates a fatal error (which stops execution immediately).
A need is something you have to have, and want is something you like to have but don't require to survive.
The main difference between mechanical and electromagnetic waves is that mechanical waves require a medium (such as air or water) to travel through, while electromagnetic waves can travel through a vacuum (empty space) because they do not require a medium.
71 is, itself an integer but to find a difference you require 3 numbers.71 is, itself an integer but to find a difference you require 3 numbers.71 is, itself an integer but to find a difference you require 3 numbers.71 is, itself an integer but to find a difference you require 3 numbers.
"Simple DDA" does not require special skills for implementation.
Proper factors do not include one and the number itself.