PHP populate single array with no keys -

i have indexed array this: $indexed = array(0=>2,1=>7,3=>9)

but need single array, without indexes, this: $notindexed = array(2,7,9)

zend_form not accept $indexed parameter function populate() multi checkboxes works fine $notindexed

how can dynamically transform $indexed $notindexed

thanx answers

$notindexed = array_values($indexed);