func_get_args

<?php
function foo() {
   $numargs = func_num_args();
   echo "Number of arguments: $numargs<br>\n";
   if ( $numargs >= 2 ) {
      echo "Second argument is: " . func_get_arg( 1 ) . "<br>\n";
   }
   $arg_list = func_get_args();
   for ( $i = 0; $i < $numargs; $i++ ) {
      echo "Argument $i is: " . $arg_list[$i] . "<br>\n";
   }
} 

foo( 1, 2, 3 );
?>