Generator return values in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a generator in PHP?

A generator is a special function that can pause its execution and yield values one at a time, allowing you to iterate over data without creating an entire array in memory.

intermediate

How do you get the return value of a generator in PHP?

You get the return value of a generator by calling the getReturn() method on the generator object after it has finished running.

beginner

What keyword is used inside a generator to specify its return value?

The return keyword is used inside a generator to specify a final return value that can be retrieved after iteration ends.

intermediate

What happens if you try to get the return value of a generator before it finishes?

If you try to get the return value before the generator finishes, it will throw an exception because the return value is only available after the generator has completed.

intermediate

Why are generator return values useful?

Generator return values let you send a final result or summary after all yielded values are processed, which is helpful for things like totals or status messages.

Which method retrieves the return value of a finished generator in PHP?

A getReturn()

B getReturnValue()

C returnValue()

D fetchReturn()

The correct method is getReturn() to get the return value after the generator finishes.

What keyword inside a generator function sets the return value?

A yield

B return

C break

D exit

The return keyword sets the final return value of the generator.

What happens if you call getReturn() on a generator that is still running?

A Returns null

B Returns the last yielded value

C Throws an exception

D Returns false

Calling getReturn() before the generator finishes throws an exception.

Which of these is NOT true about generator return values?

A They are available after iteration ends

B They can be accessed using getReturn()

C They are set using the return keyword

D They replace yielded values during iteration

Return values do not replace yielded values; they are separate and available only after iteration.

Why might you use a generator return value?

A To send a final summary after iteration

B To yield multiple values

C To pause the generator

D To restart the generator

Return values let you send a final summary or result after all values have been yielded.

Explain how to retrieve the return value from a PHP generator and why it might be useful.

Think about what happens after you finish looping through all yielded values.

Describe the difference between yielding values and returning a value in a PHP generator.

One is for producing data step-by-step, the other is for a final message.