The Stringable interface

(PHP 8)

Introduction

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

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

Interface synopsis

interface Stringable {
/* Methods */
public __toString(): string
}

Stringable Examples

Example #1 Basic Stringable Usage

<?phpclass IPv4Address implements Stringable {    private string $oct1;    private string $oct2;    private string $oct3;    private string $oct4;    public function __construct(string $oct1, string $oct2, string $oct3, string $oct4) {        $this->oct1 = $oct1;        $this->oct2 = $oct2;        $this->oct3 = $oct3;        $this->oct4 = $oct4;    }    public function __toString(): string {        return "$this->oct1.$this->oct2.$this->oct3.$this->oct4";    }}function showStuff(string|Stringable $value) {    // A Stringable will get converted to a string here by calling    // __toString.    print $value;}$ip = new IPv4Address('123', '234', '42', '9');showStuff($ip);?>

The above example will output something similar to:

123.234.42.9

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