Switch statement execution in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a switch statement in PHP?

A switch statement allows you to execute different blocks of code based on the value of a single expression. It helps to replace multiple if-else statements for cleaner code.

beginner

How does PHP decide which case to execute in a switch statement?

PHP compares the value of the switch expression with each case value using loose comparison (==). When a match is found, it executes that case's code.

intermediate

What happens if you forget to add a break statement at the end of a case block?

If you omit break, PHP will continue executing the next case(s) even if they don't match. This is called "fall-through" and can cause unexpected behavior.

beginner

What is the role of the default case in a switch statement?

The default case runs if none of the other cases match the expression. It acts like the "else" part of an if-else chain.

intermediate

Can a switch statement in PHP handle multiple cases with the same code block? How?

Yes. You can list multiple case labels one after another without break between them, so they share the same code block.

What keyword stops execution from falling through to the next case in a PHP switch statement?

A break

B continue

C stop

D exit

The break keyword ends the current case and prevents execution from continuing to the next case.

If no case matches and there is no default case, what happens in a PHP switch statement?

A An error is thrown

B The first case executes

C The switch block is skipped

D The last case executes

If no case matches and no default is provided, PHP skips the entire switch block.

How does PHP compare the switch expression to case values?

A Strict comparison (===)

B By converting to strings

C By reference

D Loose comparison (==)

PHP uses loose comparison (==) to match the switch expression with case values.

Which of the following is true about the default case in a switch statement?

A It must be the last case

B It runs only if no other case matches

C It runs before any case

D It is optional and ignored if present

The default case runs only if no other case matches the switch expression.

What happens if you list multiple case labels without breaks between them?

A All those cases share the same code block

B PHP throws a syntax error

C Only the last case runs

D Only the first case runs

Multiple case labels without breaks share the same code block, allowing grouped cases.

Explain how a PHP switch statement executes when a matching case is found. Include what happens if there is no break.

Think about how PHP moves through cases after a match.

Describe the role and importance of the default case in a PHP switch statement.

Consider what happens when no case matches.