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.