<?php

class Testclass {
  var $testvar = 'something';
}

$test = new Testclass;
echo "before foreach: $test->testvar\n"; # echos 'something'

$arr = array('testvar', 'something elseeeee');

foreach ($arr as $key => $value) {
  $test->$key = $value; # set $test->[variable] to $value
}

echo "after foreach: $test->testvar\n"; #echos 'something'