(PHP 4, PHP 5)
func_num_args — Returns the number of arguments passed to the function
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.
Returns the number of arguments passed into the current user-defined function.
| 版本 | 说明 |
|---|---|
| 5.3.0 | This function can now be used in parameter lists. |
Generates a warning if called from outside of a user-defined function.
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'
?>
Note: Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter. If this value must be passed, the results should be assigned to a variable, and that variable should be passed.