I'm trying to concatenate several variables following http://php.net/manual/en/language.variables.variable.php but I don't get why it's not working
<?PHP
$test1 = 'test1';
$test2 = 'test2';
$test0 = 'test0';
for($i=1;$i<=9;$i++){
$j = $i%3;
echo ${$test.$j};
}
?>
$colonnedefined