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

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6
cesar at magic3w dot com
10 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.<?phpclass 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 numbersecho 'Test: ' . $r->getNumberOfRequiredParameters()); //Output: 2echo 'Test2: ' . $r->getNumberOfRequiredParameters()); //Output: 2?>
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4
sebastian at sebastian-eiweleit dot de
11 years ago
<?phpnamespace ExampleWorld;// The Classclass 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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