<?php
echo PHP_VERSION."\n";
class test{
    public $var1 = 1;
    public $var2 = 2;
    public $var3 = 3;
    public $var4 = 4;
}


$class = new test();

for($i = 1; $i <= 4; $i++){
    echo $class->{'var'.$i};
}
?>

5.2.5
1234