PropertyTypeRedeclarationMismatch

A property type declaration in a child class is incompatible with the parent class declaration. Property types must be compatible across the inheritance hierarchy.

Example

<?php
class Parent {
    public string $name;
}

class Child extends Parent {
    public int $name; // Error: incompatible type
}

How to fix

Ensure the child class property type is compatible with the parent:

<?php
class Parent {
    public string $name;
}

class Child extends Parent {
    // Keep the same type or use a more specific subtype
    public string $name;
}