Functions and defaults in PHP

Typed functions whose defaults document the call site.

<?php
function brew(string $drink, string $size = "medium"): string {
    return "$size $drink";
}

function total(float $price, float $tax = 0.08, int $qty = 1): float {
    return round($price * $qty * (1 + $tax), 2);
}

echo brew("latte"), "\n";
echo brew("mocha", "large"), "\n";
echo total(3.50), "\n";
echo total(3.50, 0.0, 4), "\n";

How it works

Parameter and return types make the signature the documentation.
$size = "medium" fills in when the caller stays quiet.
total layers two defaults; callers override only what changes.

Keywords and builtins used here

brew
echo
function
return
round
total

The run, in numbers

Lines: 13
Characters to type: 331
Tokens: 106
Three-star pace: 80 tpm

At the three-star pace of 80 tokens a minute, this run takes about 80 seconds.

Type this snippet

Step 1 of 3 in Functions, step 10 of 27 in Language basics.

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