- print_r: documentation ( source)
- array_keys: documentation ( source)
<?php
$ddi = array(0 => 16, 1 => 18);
$di_array_count = count($ddi);
for($c=0; $c<$di_array_count; $c++){
$key = array_keys($ddi);
$val= $ddi[$c];
print_r($val);
}