func_num_args
(PHP 4, PHP 5)
func_num_args — Returns the number of arguments passed to the function
說明
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.
Return值
Returns the number of arguments passed into the current user-defined function.
錯誤/例外
Generates a warning if called from outside of a user-defined function.
範例
Example#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'
?>
註釋
Note: 因為這個函式依賴目前的範圍(scope)來決定參數，所以不能用當函式裡的參數使用。如果一定要傳入此數值，要將結果存入一個變數再傳入。