func_num_args(): Returns the number of parameters passed in to the calling function, the type is integer.
This function can be used in conjunction with func_get_arg() and func_get_args() to allow user-defined functions to receive variable-length parameter lists.
Return value
Returns the number of parameters passed into the function defined by the current user.
Usage example:
function foo() { $numargs = func_num_args();//返回这个函数所含的参数 echo "Num fo argumets : $numargs <br>\n"; $arr=func_get_args();//返回一个数组给$arr print_r($arr);//输出这个数组所有的参数 echo "<hr>"; for($i=0;$i<=$numargs;$i++) { echo $arr[$i]."<br>"; } } foo(1,2,3,45,6);
The running results are as follows:
Num fo argumets : 5 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 45 [4] => 6 ) -------------------------------------------------------------------------------- 1 2 3 45 6
Example 2:
<?php function foo() { include './fna.php'; } foo('First arg', 'Second arg'); ?> fna.php <?php $num_args = func_num_args(); var_export($num_args); ?>
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