<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
$valor = filter_input(INPUT_GET, "valor", FILTER_DEFAULT, FILTER_REQUIRE_ARRAY);
print_r($valor);
?>
<form>
<?php
for ($i = 0; $i < 3; $i++) {
for ($j = 0; $j < 3; $j++) {
?>
<input type="text" size="3" name="valor[<?= $i ?>][<?= $j ?>]">
<?php
}
echo "<br>";
}
?><input type="submit">
</form>
</body>
</html>