- print_r: documentation ( source)
<?php
$array1 = array('A', 'B');
$array2 = array('1', '2', '3');
$num = count($array2);
$comb = array();
$result = array();
foreach($array1 as $val)
{
foreach($comb as $co)
{
$result[] = $val."".$co;
}
}
print_r($result);