ReflectionParameter::getDefaultValue

(PHP 5 >= 5.0.3, PHP 7, PHP 8)

ReflectionParameter::getDefaultValue — Gets default parameter value

Descrição

public ReflectionParameter::getDefaultValue(): mixed

Gets the default value of the parameter for any user-defined or internal function or method. If the parameter is not optional a ReflectionException will be thrown.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

The parameters default value.

Registro de Alterações

Versão	Descrição
8.0.0	This method now allows getting the default value of parameters of built-in functions and built-in class methods. Previously, a ReflectionException was thrown.

Exemplos

Exemplo #1 Getting default values of function parameters

<?php
function foo($test, $bar = 'baz')
{
    echo $test . $bar;
}

$function = new ReflectionFunction('foo');

foreach ($function->getParameters() as $param) {
    echo 'Name: ' . $param->getName() . PHP_EOL;
    if ($param->isOptional()) {
        echo 'Default value: ' . $param->getDefaultValue() . PHP_EOL;
    }
    echo PHP_EOL;
}
?>

O exemplo acima produzirá:

Name: test

Name: bar
Default value: baz

Veja Também

ReflectionParameter::isOptional() - Checks if optional
ReflectionParameter::isDefaultValueAvailable() - Checks if a default value is available
ReflectionParameter::getDefaultValueConstantName() - Returns the default value's constant name if default value is constant or null
ReflectionParameter::isPassedByReference() - Checks if passed by reference

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User Contributed Notes 1 note

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gmail@asmqb7 ¶

8 years ago


[Editor's note: fixed on user's request]



Getting `Uncaught ReflectionException: Internal error: Failed to retrieve the default value`?



You have to wrap this inside ->isDefaultValueAvailable().

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