International PHP Conference 2015

ReflectionFunctionAbstract::getNumberOfRequiredParameters

(PHP 5 >= 5.0.3)

ReflectionFunctionAbstract::getNumberOfRequiredParametersGets number of required parameters

Descrição

public int ReflectionFunctionAbstract::getNumberOfRequiredParameters ( void )

Get the number of required parameters that a function defines.

Aviso

Esta função não está documentada; somente a lista de argumentos está disponível.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

The number of required parameters.

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User Contributed Notes 2 notes

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2
sebastian at sebastian-eiweleit dot de
1 year ago
<?php
namespace ExampleWorld;
// The Class
class helloWorld {
   
/* Method with two required arguments */

   
public function requiredTwoArguments ( $var1, $var2 ) {
       
// Some code ...
   
}

   
/* Method with two arguments, but just one is required */
   
public function requiredOneArgument ( $var1, $var2 = false ) {
       
// Some code ...
   
}
}

$r = new \ReflectionMethod ( 'ExampleWorld\helloWorld', 'requiredTwoArguments' );
echo
$r->getNumberOfRequiredParameters ();

$r = new \ReflectionMethod ( 'ExampleWorld\helloWorld', 'requiredOneArgument' );
echo
$r->getNumberOfRequiredParameters ();

// Output: 2 1
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1
cesar at magic3w dot com
1 month ago
It's interesting to note that this function will treat optional parameters that come before a required parameter as required too. This is good since it allows you to verify that the function will be receiving enough parameters for the it to work, regardless where they are located.

<?php

class MyTest() {
    public function
test($a = null, $b) {}
    public function
test2($a = null, $b, $c = null) {}
}

//Create the reflection
$r  = new \ReflectionMethod('MyTest', 'test');
$r2 = new \ReflectionMethod('MyTest', 'test2');

//Verify the numbers
echo 'Test: ' . $r->getNumberOfRequiredParameters()); //Output: 2
echo 'Test2: ' . $r->getNumberOfRequiredParameters()); //Output: 2

?>
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