PHP Conference China 2020

ReflectionParameter::getDefaultValueConstantName

(PHP 5 >= 5.4.6, PHP 7)

ReflectionParameter::getDefaultValueConstantNameReturns the default value's constant name if default value is constant or null

Descrierea

public ReflectionParameter::getDefaultValueConstantName ( void ) : 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.

Parametri

Această funcție nu are parametri.

Valorile întoarse

Returns string on success or NULL on failure.

Istoricul schimbărilor

Versiune Descriere
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.

Exemple

Example #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;
}
?>

Exemplul de mai sus va afișa:

Name: test

Name: bar
Default value: PHP_INT_MIN

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