ReflectionFunctionAbstract::getNumberOfParameters

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

ReflectionFunctionAbstract::getNumberOfParameters — パラメータ数を取得する

説明

public ReflectionFunctionAbstract::getNumberOfParameters(): int

関数で定義されているパラメータの数を、必須と任意の両方を含めて取得します。

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

パラメータの数を返します。

参考

ReflectionFunctionAbstract::getNumberOfRequiredParameters() - 必須パラメータの数を取得する
func_num_args() - 関数に渡された引数の数を返す

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User Contributed Notes 2 notes

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Robert Pitt ( LitePHP ) ¶

14 years ago

Working on a new MVC Application Framework i use this method to check how many arguments are required before calling the sub method!

Example 

<?php
        $this->method_args_count = $this->CReflection
            ->getMethod($Route->getMethod())
            ->getNumberOfParameters();
        //Maybe be 5 but if uri is /controller/method/single_param/ we only of 1
        $this->params = $Route->getParams(); //0 in some cases

        if($this->method_args_count > count($this->params))
        {
            $this->difference = ($this->method_args_count - count($this->params));
            for($i=0;$i<=$this->difference;$i++)
            {
                $this->params[] = false;
            }
        }
        
        //Call the method with correct amount of params
        // but as false for params that have not been passed!
        call_user_func_array(array(new $this->obj,$Route->getMethod()),$this->params);
?>

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8ctopus ¶

3 years ago

$reflection = new ReflectionFunction('implode');
echo $reflection->getNumberOfParameters();

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