https://pt.stackoverflow.com/q/238483/101

<?php
$adultos = array( "a", "b", "c" );
$i = 1;
foreach ($adultos as $adulto):
	echo "<strong>Quarto " . $i++ . "</strong><br>";
	echo "Adultos: " . $adulto . "<br>";
endforeach;
for ($i = 0; $i < count($adultos); $i++) {
	echo "<strong>Quarto ". $i++ ."</strong><br>";
	echo "Adultos: " . $adultos[$i] . "<br>";
}

//https://pt.stackoverflow.com/q/238483/101