func_num_args

Description

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.

<?php
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.