The Stringable interface

The Stringable interface

The  interface denotes a class as
having a  method.  Unlike most interfaces,
 is implicitly present on any class that
has the magic  method defined, although it
can and should be declared explicitly.

Stringable__toString()Stringable__toString()

Its primary value is to allow functions to type check against the union
type  to accept either a string primitive
or an object that can be cast to a string.

string|Stringable

Stringable### Stringable Examples

Voorbeeld: Basic Stringable Usage

This uses .constructor property promotion

<?php
class IPv4Address implements Stringable {
    public function __construct(
        private string $oct1,
        private string $oct2,
        private string $oct3,
        private string $oct4,
    ) {}

    public function __toString(): string {
        return "$this->oct1.$this->oct2.$this->oct3.$this->oct4";
    }
}

function showStuff(string|Stringable $value) {
    // For a Stringable, this will implicitliy call __toString().
    print $value;
}

$ip = new IPv4Address('123', '234', '42', '9');

showStuff($ip);
?>

123.234.42.9