Functions & Scope - Concepts
Explore the key concepts of functions & scope with practical examples and exercises.
45 min•By Priygop Team•Last updated: Feb 2026
Introduction to Functions & Scope
In this section, we cover the fundamental aspects of functions & scope. 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 functions & scope
- 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
Functions & Scope - Code Example
Example
<?php
function greet(string $name, string $greeting = "Hello"): string {
return "$greeting, $name!";
}
echo greet("Alice") . "\n";
echo greet("Bob", "Hi") . "\n";
// Arrow function
$double = fn($x) => $x * 2;
echo $double(5) . "\n";
// Variadic function
function sum(int ...$numbers): int {
return array_sum($numbers);
}
echo sum(1, 2, 3, 4, 5) . "\n";
// Closure
$multiplier = function($factor) {
return fn($x) => $x * $factor;
};
$triple = $multiplier(3);
echo $triple(10) . "\n";
?>Try It Yourself: Functions & Scope
Try It Yourself: Functions & ScopeJavaScript⚠ 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
JavaScript|15 lines|435 chars|1 error, 0 warnings
UTF-8