PHP Functions
Functions are reusable blocks of code defined with function.
Type Declarations (PHP 7+)
Declare parameter and return types for safer code.
Return Types
Add : type after the parentheses. Use ?type for nullable.
Example
<?php
// Basic function
function greet(string $name): string {
return "Hello, $name!";
}
echo greet("Alice"); // Hello, Alice!
// Default parameters
function power(float $base, int $exp = 2): float {
return $base ** $exp;
}
echo power(3); // 9
echo power(2, 10); // 1024
// Multiple return types (PHP 8 union types)
function divide(int $a, int $b): float|false {
return $b !== 0 ? $a / $b : false;
}
?>