ReflectionParameter::getDefaultValue

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

ReflectionParameter::getDefaultValueGets default parameter value

Descrizione

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.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

The parameters default value.

Log delle modifiche

Versione Descrizione
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.

Esempi

Example #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;
}
?>

Il precedente esempio visualizzerà:

Name: test

Name: bar
Default value: baz

Vedere anche:

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User Contributed Notes 1 note

up
5
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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