PHPerKaigi 2021

ReflectionProperty::hasDefaultValue

(PHP 8)

ReflectionProperty::hasDefaultValueChecks if property has a default value declared

Description

public ReflectionProperty::hasDefaultValue ( ) : bool

Checks whether the property was declared with a default value, including an implicit null default value. Only returns false for typed properties without default value (or dynamic properties).

Parameters

This function has no parameters.

Return Values

If the property has any default value (including null) true is returned; if the property is typed without a default value declared or is a dynamic property, false is returned.

Examples

Example #1 ReflectionClass::hasDefaultValue() example

<?php
class Foo {
    public 
$bar;
    public ?
int $baz;
    public ?
int $foo null;
    public 
int $boing;
    
    public function 
__construct()
    {
        
$this->ping '';
    }
}

$ro = new ReflectionObject(new Foo());
var_dump($ro->getProperty('bar')->hasDefaultValue());
var_dump($ro->getProperty('baz')->hasDefaultValue());
var_dump($ro->getProperty('foo')->hasDefaultValue());
var_dump($ro->getProperty('boing')->hasDefaultValue());
var_dump($ro->getProperty('ping')->hasDefaultValue()); // Dynamic property
var_dump($ro->getProperty('pong')->hasDefaultValue()); // Not defined property
?>

The above example will output:

bool(true)
bool(false)
bool(true)
bool(false)
bool(false)

Fatal error: Uncaught ReflectionException: Property Foo::$pong does not exist in example.php

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