Loops and Branches

Question 1

What are the comparison operators?

Answer 1

==

!=
>
>=
- $a is not equal to $b after type juggling.
- An integer less than, equal to, or greater than zero when $a is respectively less than, equal to, or greater than $b. Available as of PHP 7.
Null - The first operand from left to right that exists and is not NULL. NULL if no values are defined and not NULL. Available as of PHP 7.

Question 2

What does ‘default’ do in a switch statement?

Answer 2

The default action executes if none of the other switch statements are true.

Question 3

What happens if you do not include ‘break’ into your switch cases?

Answer 3

It will continue executing the statements of following cases.

Question 4

What is the syntax of a “for” loop?

Answer 4

for( initialization; condition; increment ){ // block of commands; }

Question 5

What is the difference between “while” and “do while” loops?

Answer 5

The “do while” loop will always execute at least one time because the condition comes after the command block, whereas the “while” loop condition occurs before the command block.

Question 6

What are the ideal use cases for “for” loops and “while” loops?

Answer 6

The “while” loop is most useful when you have an unknown or variable number of items to loop through. The “for” loop is most useful when you have a fixed number.

Question 7

What is the syntax of a “foreach” loop?

Answer 7

foreach($array as $key => value){
   // block of commands
}

Question 8

What is a “foreach” loop?

Answer 8

It is made specifically for use with arrays, to iterate through an array from beginning to end.

Question 9

What is the “continue” command?

Answer 9

“Continue” is used to skip a block of code but continue inside a loop.

Question 10

What is the “goto” command?

Answer 10

“Goto” is used to force a jump to a specific place in the program.