1.2.578. Inherited Property Type Must Match¶

Properties that are inherited between classes must match.

This affect public and protected properties. Private properties are immune to this rule, as they actually are distinct properties.

<?php

class A {
    private A $a;
    protected array $b;
    public $c;
}

class B extends A {
    private A $a;       // OK, as it is private
    protected int $b;   // type must match with the previous definition
    public $c;          // no type behaves just like a type : it must match too.
}

?>

See also Properties.

1.2.578.2. Connex PHP features¶

inheritance

property

1.2.578.2.1. Suggestions¶

Remove the definition in the child class
Synchronize the definition of the property in the child class

1.2.578.2.2. Specs¶

Short name	Classes/InheritedPropertyMustMatch
Rulesets	All, Analyze, Changed Behavior, Class Review, LintButWontExec
Exakat since	2.2.2
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	High
Note	This issue may lint but will not run
Available in	Entreprise Edition, Exakat Cloud