func_num_args
(PHP 4, PHP 5)
func_num_args -- Returns the number of arguments passed to the function
说明
int
func_num_args ( void )
Gets the number of arguments passed to the function.
This function may be used in conjunction with
func_get_arg() and func_get_args()
to allow user-defined functions to accept variable-length argument lists.
返回值
Returns the number of arguments passed into the current user-defined
function.
错误／异常
Generates a warning if called from outside of a user-defined function.
范例
例 1. func_num_args() example
<?php
function foo()
{
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
}
foo(1, 2, 3); // Prints 'Number of arguments: 3'
?>
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注释
注意: Because this function depends on the
current scope to determine parameter details, it cannot be used as a
function parameter. If you must pass this value, assign the results to a
variable, and pass the variable.