Yield keyword behavior in PHP - Mini Project: Build & Apply

Yield keyword behavior

📖 Scenario: Imagine you have a list of tasks to do, but you want to handle them one by one without loading all at once. Using yield in PHP helps you do this efficiently.

🎯 Goal: You will create a generator function using yield to produce tasks one at a time, then loop through them to display each task.

📋 What You'll Learn

Create an array called $tasks with exact string values: 'Clean', 'Cook', 'Shop'

Create a generator function called taskGenerator that uses yield to return each task from $tasks

Use a foreach loop with variable $task to iterate over taskGenerator()

Print each task inside the loop using echo

💡 Why This Matters

🌍 Real World

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

💼 Career

Understanding <code>yield</code> helps in writing memory-efficient PHP code, useful in backend development and data processing jobs.

1

Create the tasks array

Create an array called $tasks with these exact string values: 'Clean', 'Cook', 'Shop'.

PHP

# Your code here

Need a hint?

Use square brackets to create the array and separate values with commas.

2

Create the generator function

Create a generator function called taskGenerator that uses yield to return each task from the $tasks array.

PHP

<?php
$tasks = ['Clean', 'Cook', 'Shop'];

// Define the generator function taskGenerator
# Your code here

Need a hint?

Use foreach to loop over $tasks and yield each $task.

3

Loop through the generator

Use a foreach loop with variable $task to iterate over taskGenerator().

PHP

<?php
$tasks = ['Clean', 'Cook', 'Shop'];

function taskGenerator() {
    global $tasks;
    foreach ($tasks as $task) {
        yield $task;
    }
}

// Loop through the generator
# Your code here

Need a hint?

Use foreach with taskGenerator() and variable $task.

4

Print each task

Inside the foreach loop, print each $task using echo followed by a newline.

PHP

<?php
$tasks = ['Clean', 'Cook', 'Shop'];

function taskGenerator() {
    global $tasks;
    foreach ($tasks as $task) {
        yield $task;
    }
}

foreach (taskGenerator() as $task) {
    // Print each task
    # Your code here
}

Need a hint?

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