ReflectionParameter::getDefaultValueConstantName

(PHP 5 >= 5.4.6, PHP 7, PHP 8)

ReflectionParameter::getDefaultValueConstantName — Returns the default value's constant name if default value is constant or null

Descrição

public ReflectionParameter::getDefaultValueConstantName(): ?string

Returns the default value's constant name of the parameter of any user-defined or internal function or method, if default value is constant or null. If the parameter is not optional a ReflectionException will be thrown.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Returns string on success or null on failure.

Registro de Alterações

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

Exemplos

Exemplo #1 Getting default values' constant names of function parameters

<?php
function foo($test, $bar = PHP_INT_MIN)
{
    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->getDefaultValueConstantName() . PHP_EOL;
    }
    echo PHP_EOL;
}
?>

O exemplo acima produzirá:

Name: test

Name: bar
Default value: PHP_INT_MIN

Veja Também

ReflectionParameter::isOptional() - Checks if optional
ReflectionParameter::isDefaultValueConstant() - Returns whether the default value of this parameter is a constant
ReflectionParameter::getDefaultValue() - Gets default parameter value

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