query($sql);
$contacts=array();
//while($pers=$data->fetch(PDO::FETCH_OBJ)){
while($pers=$data->fetch(PDO::FETCH_ASSOC)){
$contacts[]=$pers;
}
//print_r($contacts);
$json = json_encode($contacts, JSON_PRETTY_PRINT);
echo 'json :
'.PHP_EOL;
print($json);
#echo '
'.PHP_EOL;
#echo 'décodage du json :
'.PHP_EOL;
#print_r(json_decode($json, true));