<?php
$dados = [
['24/01/24','Arroz'],
['25/01/24','Macarrao'],
['26/01/24','Feijao']
]; // obtenha com fetchAll
for($i=0; $i < $num; ++$i) {
echo 'DATA :'.$dados[$i][0] . ' COMPRA DO DIA : ' . $dados[$i][1];
if ($i + 1 < $num) echo ' - ' . $dados[$i + 1][1];
echo "\n";
}
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