After your update. It seems that you forget a foreach. I hope it's helpful to achieve what you want.
// Following your dump
$textfields = array( 0 => array( 1234, "qwer", "abcd"), 1 => array("5678", "tyui", "efgh"));
if (!empty($textfields)) {
foreach ($textfields as $textfield) {
// First loop : 0 => array( 1234, "qwer", "abcd")
// Second loop: 1 => array("5678", "tyui", "efgh")
foreach ($textfield as $oneValue) {
// Loop on the second array $textfield
}
}