(PHP4 >= 4.0b4)

func_num_args --  Returns the number of arguments passed to the function


int func_num_args (void )

Returns the number of arguments passed into the current user-defined function. Func_num_args() will generate a warning if called from outside of a function definition.

function foo() {
    $numargs = func_num_args();
    echo "Number of arguments: $numargs\n";

foo (1, 2, 3);    // Prints 'Number of arguments: 3'

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

Note: This function was added in PHP 4.