ReflectionFunctionAbstract::getNumberOfRequiredParameters

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

ReflectionFunctionAbstract::getNumberOfRequiredParameters — 获取必须输入参数个数

说明

public ReflectionFunctionAbstract::getNumberOfRequiredParameters ( ) : int

获取函数定义中，必须输入的参数个数

Warning

本函数还未编写文档，仅有参数列表。

参数

此函数没有参数。

返回值

必须输入的参数个数

参见

ReflectionFunctionAbstract::getNumberOfParameters() - 获取参数数目

User Contributed Notes

cesar at magic3w dot com 07-Jul-2015 12:45


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



?>

sebastian at sebastian-eiweleit dot de 02-Sep-2013 03:03


<?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