Promoted Properties

Promoted properties are a class’s arguments, which are declared as properties and automatically assigned their value at instantiation.

<?php

    class X {
        function __construct($property, public int $promotedProperty) {
            $this->property = $property; // manual initialization

            // not initilization of $this->promotedProperty, as it is automatic
            echo $promotedProperty; // the variable version is available for further processing
            echo $this->promotedProperty; // the property is available immediately
        }
    }

?>

Documentation

See also Class constructor property promotion.

Related : Properties, Class, Constructor, Property Type Declaration, Var

Added in PHP 8.0