ReflectionFunctionAbstract::getNumberOfParameters

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

ReflectionFunctionAbstract::getNumberOfParameters — 获取参数数目

说明

public ReflectionFunctionAbstract::getNumberOfParameters(): int

获取函数定义的参数数量，包括可选参数。

参数

此函数没有参数。

返回值

参数的个数。

参见

ReflectionFunctionAbstract::getNumberOfRequiredParameters() - 获取必须输入参数个数
func_num_args() - 返回传递给函数的参数数量

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用户贡献的备注 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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-2

8ctopus ¶

4 years ago

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

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备份地址：http://www.lvesu.com/blog/php/reflectionfunctionabstract.getnumberofparameters.php