Course/Module 5/Topic 1 of 3Intermediate

Arrays & Array Functions - Concepts

Explore the key concepts of arrays & array functions with practical examples and exercises.

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

Introduction to Arrays & Array Functions

In this section, we cover the fundamental aspects of arrays & array functions. You'll learn core concepts, see real-world examples, and understand how to apply them in your projects.

Key Concepts

Understanding the core principles of arrays & array functions
Practical applications and real-world use cases
Step-by-step implementation guides
Common patterns and best practices
Tips for debugging and troubleshooting
Performance optimization techniques

Arrays & Array Functions - Code Example

Example

<?php
// Indexed array
$fruits = ["apple", "banana", "cherry"];

// Associative array
$person = [
    "name" => "Alice",
    "age" => 25,
    "email" => "alice@example.com"
];

// Array functions
$numbers = [3, 1, 4, 1, 5, 9, 2, 6];
sort($numbers);
echo "Sorted: " . implode(", ", $numbers) . "\n";

$doubled = array_map(fn($n) => $n * 2, $numbers);
echo "Doubled: " . implode(", ", $doubled) . "\n";

$evens = array_filter($numbers, fn($n) => $n % 2 == 0);
echo "Evens: " . implode(", ", $evens) . "\n";

$sum = array_reduce($numbers, fn($carry, $n) => $carry + $n, 0);
echo "Sum: $sum\n";
?>

Try It Yourself: Arrays & Array Functions

Try It Yourself: Arrays & Array FunctionsJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected token '<'

💡 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

Quick Quiz: Arrays & Array Functions

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