PHP函数找出传入函数的参数个数? [英] PHP function to find out the number of parameters passed into function?

问题描述

是否有 PHP 函数可以查找要接收/传递给特定函数的参数数量?

Is there a PHP function to find the number of parameters to be received/passed to a particular function?

推荐答案

func_num_args

获取传递给函数的参数数量.

Gets the number of arguments passed to the function.

这是从上面的链接中获取的示例，

Here is an example taken right from the link above,

<?php
function foo()
{
    $numargs = func_num_args();
    echo "Number of arguments: $numargs\n";
}

foo(1, 2, 3);   
?>

哪些输出，

Number of arguments: 3

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