These seem to be some arrays, but, what do these PHP codes mean?

These seem to be some arrays, but, what do these PHP codes mean?

Can somebody explain to me what does each line of the code inside the for
loop below mean or do?
$var = array();
$ship = $_POST['product'];
$amount = count( $ship );
for ($i = 0; $i < $amount; $i++){
$var[$i]['product']
$ship[$i]
$var[$i]['name'] = $ship[$i];
echo $var;
}
Thank you!