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PHP Variadic Functions

Intermediate~20 min read

Variadic functions accept a variable number of arguments using the splat operator (...). Perfect for flexible functions like sum(), max(), or custom utilities!

Output 
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Variadic Parameters

<?php
function sum(...$numbers) {
    return array_sum($numbers);
}

echo sum(1, 2, 3);        // 6
echo sum(1, 2, 3, 4, 5);  // 15
?>

Mixed Parameters

<?php
function formatList($separator, ...$items) {
    return implode($separator, $items);
}

echo formatList(", ", "apple", "banana", "cherry");
?>

Summary

  • Syntax: ...$params
  • Variable args: Accept any number
  • Type hints: int ...$nums
  • Unpacking: func(...$array)

What's Next?

Finally, learn about Function Scope - global, local, and static variables!

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