- print_r: documentation ( source)
<?php
$daysOfWeek = array('nd','pon','wt','sr','czw','pt','so');
foreach($daysOfWeek as $key=>$value) {
echo $key.' '.$value;
}
$converted = array();
foreach ($daysOfWeek as $key=>$checked) {
$converted[++$key] = $checked;
}
$converted[0] = $converted[7];
unset($converted[7]);
print_r($converted);