Commande each plus valide en php 8.1

Tu n'as pas répondu à mes questions ......

Mais je suppose que ce que tu veux obtenir, c'est la liste des "clés"....
Tu pourrais, dans ton foreach faire

$rooms = [];
foreach($room_hash as $K => $V){
  $rooms[] = $K;
}

Sinon, plus propre.. il existe la fonction array_keys
https://www.php.net/manual/fr/function.array-keys.php

voici le code servant à créer le tableau :
while (list($room_key) = each($room_hash)) $rooms[] = $room_key;
sort($rooms);
reset($name_hash);
while (list($name_key) = each($name_hash)) $names[] = $name_key;
// foreach ($name_hash as $name_key) $names[] = $name_key;
sort($names);
$n_rooms = sizeof($rooms);
$n_names = sizeof($names);

// On affiche uniquement pour une sortie HTML
if ($csv == "n")
{
if ($sumby=="1")
$premiere_cellule = "Paroisse";
else if ($sumby=="5")
$premiere_cellule = "Type";
else if ($sumby=="6")
$premiere_cellule = "Utilisateur";
else if ($sumby=="7")
$premiere_cellule = "Jour";
else if ($sumby=="8")
$premiere_cellule = "Semaine";
else if ($sumby=="9")
$premiere_cellule = "Mois";
else
$premiere_cellule = grr_sql_query1("select fieldname from grr_overload where id='$sumby'");

echo "<hr /><h1>Comptage des réservations : (nombre) heures / frais </h1><table border=2 cellspacing=4>\n";
if ($sumby=="1")
echo "<tr><td class=\"BL\" align=left><b>".$premiere_cellule." \ Mois</b></td>\n";
else
echo "<tr><td class=\"BL\" align=left><b>".$premiere_cellule." \ Salle</b></td>\n";
}

for ($c = 0; $c < $n_rooms; $c++)
{
if ($csv == "n")
echo "<td class=\"BL\" align=left><b>$rooms[$c]</b></td>\n";
else
echo "$rooms[$c]\t";

$col_count_total[$c] = 0;
$col_hours_total[$c] = 0.0;
$col_frais_total[$c] = 0;
}
if ($csv == "n")
echo "<td class=\"BR\" align=right><br><b>Total</b></td></tr>\n";
else
echo "Total\t\r\n";

$grand_count_total = 0;
$grand_hours_total = 0;
$grand_frais_total = 0;

for ($r = 0; $r < $n_names; $r++)
{
$row_count_total = 0;
$row_hours_total = 0.0;
$row_frais_total = 0;
$name = $names[$r];
if ($csv == "n")
echo "<tr><td class=\"BR\" align=right><b>$name</b></td>\n";
else
echo "$name\t";

for ($c = 0; $c < $n_rooms; $c++)
{
$room = $rooms[$c];
if (isset($count[$room][$name]))
{
$count_val = $count[$room][$name];
$hours_val = $hours[$room][$name];
$frais_val = $frais[$room][$name];
cell($count_val, $hours_val, $frais_val, $csv, $decompte);

$row_count_total += $count_val;
$row_hours_total += $hours_val;
$row_frais_total += $frais_val;

$col_count_total[$c] += $count_val;
$col_hours_total[$c] += $hours_val;
$col_frais_total[$c] += $frais_val;

} else {
if ($csv == "n")
echo "<td> </td>\n";
else
echo "\t";
}
}
cell($row_count_total, $row_hours_total, $row_frais_total, $csv, $decompte);

if ($csv == "n")
echo "</tr>\n";
else
echo "\r\n";
$grand_count_total += $row_count_total;
$grand_hours_total += $row_hours_total;
$grand_frais_total += $row_frais_total;
$grand_moyenh_total = round($row_hours_total/$row_count_total);
$grand_moyenf_total = round($row_frais_total/$row_count_total);
}

j'ai fait une petite erreur de recopie : le while était en fait : while (list($lib, $pos) = each($colonnes)), bien sûr