(PHP 8)
ReflectionProperty::getDefaultValue — Returns the default value declared for a property
Gets the implicit or explicitly declared default value for a property.
This function has no parameters.
The default value if the property has any default value (including null).
If there is no default value, then null is returned. It is not possible to differentiate
between a null default value and an uninitialized typed property.
Use ReflectionProperty::hasDefaultValue() to detect the difference.
Note:
For promoted properties, the default value is only applied to the constructor parameter, not to the property itself, so this method returns
nulland ReflectionProperty::hasDefaultValue() returnsfalse. Use ReflectionParameter::getDefaultValue() on the matching constructor parameter to get it.
| Version | Description |
|---|---|
| 8.5.0 | Calling ReflectionProperty::getDefaultValue() for properties without default values has been deprecated. |
Example #1 ReflectionProperty::getDefaultValue() example
<?php
class Foo {
public $bar = 1;
public ?int $baz;
public int $boing = 0;
public function __construct(public string $bak = "default") { }
}
$ro = new ReflectionClass(Foo::class);
var_dump($ro->getProperty('bar')->getDefaultValue());
var_dump($ro->getProperty('baz')->getDefaultValue());
var_dump($ro->getProperty('boing')->getDefaultValue());
var_dump($ro->getProperty('bak')->getDefaultValue());
?>The above example will output:
int(1) NULL int(0) NULL
An equivalent for PHP 7:
<?php
$reflectionProperty = new \ReflectionProperty(Foo::class, 'bar');
//PHP 8:
$defaultValue = $reflectionProperty->getDefaultValue();
//PHP 7:
$defaultValue = $reflectionProperty->getDeclaringClass()->getDefaultProperties()['bar'] ?? null;
?>