Priygop - Leading Professional Development Platform

Arrays & Array Functions - Practice

Practice is how concepts move from short-term memory into genuine skill. This practice section for arrays & array functions contains carefully designed exercises that reinforce each concept from different angles. The exercises progress from straightforward application to more challenging problem-solving scenarios. Research in cognitive science shows that retrieval practice (actively recalling and applying knowledge) is far more effective than passive review. Work through these exercises without looking at answers first — the struggle is where the learning happens

50 min•By Priygop Team•Last updated: Feb 2026

Practice makes perfect! In this section, you'll work through practical exercises that reinforce the concepts covered in this module.

Exercises

Exercise 1: Apply the fundamental arrays & array functions concepts

Exercise 2: Work through practical PHP challenges that reinforce core concepts

Exercise 3: Build a hands-on mini-project that demonstrates your mastery of arrays & array functions

Exercise 4: Identify and fix real-world bugs and common pitfalls in PHP code

Practice: Arrays & Array Functions

Practice: Arrays & Array FunctionsJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected token '<'

Tip: Missing or extra {}()[] or operator near the error.

JavaScript Editor

✕ 1 errorTab = 2 spaces

<?php
$students = [
    ["name" => "Alice", "grade" => 92],
    ["name" => "Bob", "grade" => 85],
    ["name" => "Charlie", "grade" => 95],
    ["name" => "Diana", "grade" => 78]
];

// Sort by grade descending
usort($students, fn($a, $b) => $b["grade"] - $a["grade"]);

echo "Rankings:\n";
foreach ($students as $i => $s) {
    echo ($i + 1) . ". {$s['name']}: {$s['grade']}\n";
}

$avg = array_sum(array_column($students, "grade")) / count($students);
echo "Average: " . round($avg, 1) . "\n";
?>

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

JavaScript|19 lines|498 chars|1 error, 0 warnings

UTF-8

Arrays & Array Functions - Practice

50 min•By Priygop Team•Last updated: Feb 2026

Exercises

Exercise 1: Apply the fundamental arrays & array functions concepts

Exercise 2: Work through practical PHP challenges that reinforce core concepts

Exercise 3: Build a hands-on mini-project that demonstrates your mastery of arrays & array functions

Exercise 4: Identify and fix real-world bugs and common pitfalls in PHP code

Practice: Arrays & Array Functions

Practice: Arrays & Array FunctionsJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected token '<'

Tip: Missing or extra {}()[] or operator near the error.

JavaScript Editor

✕ 1 errorTab = 2 spaces

<?php
$students = [
    ["name" => "Alice", "grade" => 92],
    ["name" => "Bob", "grade" => 85],
    ["name" => "Charlie", "grade" => 95],
    ["name" => "Diana", "grade" => 78]
];

// Sort by grade descending
usort($students, fn($a, $b) => $b["grade"] - $a["grade"]);

echo "Rankings:\n";
foreach ($students as $i => $s) {
    echo ($i + 1) . ". {$s['name']}: {$s['grade']}\n";
}

$avg = array_sum(array_column($students, "grade")) / count($students);
echo "Average: " . round($avg, 1) . "\n";
?>

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

JavaScript|19 lines|498 chars|1 error, 0 warnings

UTF-8

Arrays & Array Functions - Practice

Hands-On Practice

Exercises

Practice: Arrays & Array Functions

Review Quiz

Topics in This Module

Arrays & Array Functions - Practice

Hands-On Practice

Exercises

Practice: Arrays & Array Functions

Review Quiz

Topics in This Module