1. what is call by reference in php?
2. difference between require and require_once
3. stack and queue, how this related to sorting function?
4. what's the difference between == and ===?

Question

1. what is call by reference in php?
2. difference between require and require_once
3. stack and queue, how this related to sorting function?
4. what's the difference between == and ===?

gosick · Accepted Answer

Q4.
"===" is identical true and "==" is equal

for example
$a === $b
                  TRUE if $a is equal to $b, and they are of the same type. 
$a == $b
                  TRUE if $a is equal to $b after type juggling.

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