func_get_args

Returns an array comprising a function's argument list (PHP 4, PHP 5)
array func_get_args ( )

Returns an array in which each element is a copy of the corresponding member of the current user-defined function's argument list. func_get_args() will generate a warning if called from outside of a function definition. This function cannot be used directly as a function parameter. Instead, its result may be assigned to a variable, which can then be passed to the function.

注意:

This function returns a copy of the passed arguments only, and does not account for default (non-passed) arguments.

注意:

因为本函数依赖于当前域来决定参数细节,因此不能用作函数参数。如果必须要传递这个值,将结果赋给一个变量,然后传递该变量。

<?php
function foo()
{
   
$numargs = func_num_args();
   echo
"Number of arguments: $numargs<br />\n";
   if (
$numargs >= 2) {
       echo
"Second argument is: " . func_get_arg(1) . "<br />\n";
   }
   
$arg_list = func_get_args();
   for (
$i = 0; $i < $numargs; $i++) {
       echo
"Argument $i is: " . $arg_list[$i] . "<br />\n";
   }
}

foo(1, 2, 3);
?>

func_get_args() may be used in conjunction with func_num_args() and func_get_arg() to allow user-defined functions to accept variable-length argument lists.