Creation of dynamic property %s::$%s is deprecated

Description

When PHP uses an undefined property for a writing access, it used to create that property on the fly. The property is created with public visibility, not type nor default value.

Since PHP 8.2, this is a deprecated feature. In a later version, by default, dynamic properties will be forbidden, and activated case by case, using sdtClass or the #[AllowDynamicProperties] attribute.

Example

<?php

class X {
    public $property = 1;
}

$x = new X;
$x->property = 2;
// This is a dynamic property
$x->other = 3;

?>

Solutions

• Declare the property in the class definition.

• Create an array and store the properties there.

• Create a stdClass object and store the properties there.

• Add the #[AllowDynamicProperties].

Changed Behavior

This error may appear following an evolution in behavior, in previous versions. See dynamicProperties.

Changed Behavior

This error may appear following an evolution in behavior, in previous versions. See dynamicProperties.

Static Analysis

This error may be tracked down with the following static analysis rules: Classes/UndefinedProperty.