ReflectionFunctionAbstract::getNumberOfRequiredParameters

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

    ReflectionFunctionAbstract::getNumberOfRequiredParameters — 必須パラメータの数を取得する

    説明

    public ReflectionFunctionAbstract::getNumberOfRequiredParameters(): int

    関数で定義されている必須パラメータの数を取得します。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    必須パラメータの数を返します。

    参考

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    User Contributed Notes 2 notes

    up
    6
    cesar at magic3w dot com
    9 years 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

    ?>
    up
    4
    sebastian at sebastian-eiweleit dot de
    11 years 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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