The Stringable interface

(PHP 8)


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

class IPv4Address implements Stringable {
string $oct1;
string $oct2;
string $oct3;
string $oct4;

    public function 
__construct(string $oct1string $oct2string $oct3string $oct4) {
$this->oct1 $oct1;
$this->oct2 $oct2;
$this->oct3 $oct3;
$this->oct4 $oct4;

    public function 
__toString(): string {

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');


The above example will output something similar to:

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