- print_r: documentation ( source)
- iterator_to_array: documentation ( source)
<?php
$array = array(1, array(2,3, array("a","b","c")));
$output = iterator_to_array(new RecursiveIteratorIterator(
new RecursiveArrayIterator($array)), TRUE);
print_r($output);
/**
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => a
[4] => b
[5] => c
)