Generator function execution model in PHP - Mini Project: Build & Apply

Generator function execution model

📖 Scenario: Imagine you want to process a list of numbers one by one without loading them all into memory at once. PHP generators help you do this efficiently.

🎯 Goal: You will create a generator function that yields numbers from 1 to 5, then use it to print each number step-by-step.

📋 What You'll Learn

Create a generator function named numberGenerator that yields numbers 1 through 5

Create a variable $gen that holds the generator returned by numberGenerator()

Use a foreach loop with variable $num to iterate over $gen

Print each number inside the loop using echo

💡 Why This Matters

🌍 Real World

Generators are useful when working with large data streams or files where loading everything at once is not efficient.

💼 Career

Understanding generators helps in writing memory-efficient PHP code, important for backend development and data processing tasks.

1

Create the generator function

Write a generator function called numberGenerator that yields the numbers 1, 2, 3, 4, and 5 one by one using yield.

PHP

<?php

// Create generator function numberGenerator that yields 1 to 5
// Your code here

Need a hint?

Use the yield keyword inside the function to return each number one at a time.

2

Create the generator variable

Create a variable called $gen and assign it the generator returned by calling numberGenerator().

PHP

<?php

function numberGenerator() {
    yield 1;
    yield 2;
    yield 3;
    yield 4;
    yield 5;
}

// Create variable $gen to hold the generator from numberGenerator()
// Your code here

Need a hint?

Call the function numberGenerator() and assign it to $gen.

3

Iterate over the generator

Use a foreach loop with variable $num to iterate over $gen.

PHP

<?php

function numberGenerator() {
    yield 1;
    yield 2;
    yield 3;
    yield 4;
    yield 5;
}

$gen = numberGenerator();

// Use foreach loop with $num to iterate over $gen
// Your code here

Need a hint?

Use foreach ($gen as $num) to get each number from the generator.

4

Print each number

Inside the foreach loop, print each number stored in $num followed by a newline using echo.

PHP

<?php

function numberGenerator() {
    yield 1;
    yield 2;
    yield 3;
    yield 4;
    yield 5;
}

$gen = numberGenerator();

foreach ($gen as $num) {
    // Print $num followed by a newline
    // Your code here
}

Need a hint?

Use echo $num . "\n"; to print each number on its own line.