PHP typed property, how to define default value for object [duplicate]

Question

I have a class with typed property object. I need to define default empty value for that property:

This doesn't work:

public object $doctor = new \stdClass();

Is this even possible?

"This declaration may include an initialization, but this initialization must be a constant value" From the Docs. — Andreas
– Andreas, Commented Feb 9, 2021 at 17:05
Either set it in constructor or in __get(). Or possible check it and instantiate it when needed to use it. — AbraCadaver
– AbraCadaver, Commented Feb 9, 2021 at 17:23
From the docs: "Typed properties must be initialized before accessing, otherwise an Error is thrown." — sativay
– sativay, Commented Feb 9, 2021 at 17:38

disjunction · Accepted Answer · 2021-02-09 18:14:31Z

2

This is impossible and the error you get (Constant expression contains invalid operations) explains why: in PHP the properties can only be initialized with constant expressions. You can't use any function calls, variables or an expression producing a new object instance like in your case.

See more details here: PHP Error : Fatal error: Constant expression contains invalid operations

As a workaround I'd suggest initializing the property in the constructor

answered Feb 9, 2021 at 18:14

disjunction

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Rubén Vázquez · Accepted Answer · 2021-02-09 17:24:49Z

1

Just declare a new class instance and fill $ obj = new stdClass ();

public object $doctor = new stdClass();

$doctor->name="namedoctor"

$doctor->titles= array('doc', 'specialist');

answered Feb 9, 2021 at 17:24

Rubén Vázquez

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