- print_r: documentation ( source)
<?php
$arrays = array(
array('one', 1 => 'two', 2 => 'three' ),
array('four', 1 => 'five', 2 => 'six' ),
array('seven', 1 => 'eight', 2 => 'nine' ),
);
print_r((array) new RecursiveIteratorIterator(new RecursiveArrayIterator($arrays)));