ReflectionParameter::isDefaultValueAvailable

(PHP 5 >= 5.0.3)

ReflectionParameter::isDefaultValueAvailable — Checks if a default value is available

Description

public bool ReflectionParameter::isDefaultValueAvailable ( void )

Checks if a default value for the parameter is available.

Parameters

This function has no parameters.

Return Values

TRUE if a default value is available, otherwise FALSE


A quick gotcha that I wasn't aware of, suppose you have a function definition like this:



<?php

function foo(array $bar = array('baz' => ''),$che){}

?>



And you want to check if $bar has a default value:



<?php

$rfunc = new ReflectionFunction('foo');

$rparams = $rfunc->getParams();



echo $rparams[0]->isDefaultValueAvailable() ? 'TRUE' : 'FALSE';

?>



That will echo 'FALSE' because $che has no default value so $bar becomes required and the Reflection interface no long sees $bar's default value of array('baz' => '').



The solution is to give $che a default value also:



<?php

function foo(array $bar = array('baz' => ''),$che = null){}

?>



And then $bar's default value will be visible again.



While I understand why it does this, I still wish there was a way to get the default value without resorting to giving all params after it a default value also.

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ReflectionParameter::isDefaultValueAvailable

Description

Parameters

Return Values

See Also