<?php

$database= array ("data1","data2","data3","data4","data5","data6");

$start = 'data2';
$end = 'data4';
$started = false;
foreach ($database as $key=>$data){
	if ($data == $start) {
		$started = true;
	}
	if ($started == true) {
		echo $data;
	}
	if ($data == $end) {
		break;
	}
}