Types

What it is

PHP has scalar, compound, and special types.

When to use it

Declare expectations at boundaries and convert validated input explicitly.

Syntax

string | int | float | bool | array | object | null

Example

function total(int $quantity, int $unitCents): int
{
    return $quantity * $unitCents;
}

Common mistakes

Do not assume request strings are already integers; check range before conversion.

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