ordena.php

<?php

$array = array(0,7,9,4,5,2,6,1,3);

$troca = true;

$tamanho = count($array);

$temp;

while($troca) {

	$troca = false;

	for($i = 0; $i <= ($tamanho - 2); $i++) {

		if($array[$i] < $array[$i + 1]) {
			
			$temp = $array[$i];
			$array[$i] = $array[$i+1];
			$array[$i+1] = $temp;

			$troca = true;

		}
	}
}

echo '<p>crescente</p>';

for ($g = $tamanho -1; $g >= 0; $g--) { 
	echo $array[$g];
}

echo '<p>decrescente</p>';

for($j = 0; $j < count($array); $j++) {
	echo $array[$j];
}
?>