PHP: Merging arrays with the same title

PHP: Merging arrays with the same title

I have some php arrays from a loop, all of them bearing the same name. Now
I want to merge them, but it seems not to work...
Here's my loop:
while($row = mysql_fetch_row($sql1)){
$startzeit=strtotime($row[2]);
$endzeit=strtotime($row[3]);
$startzeit_format = date("Y-m-d",$startzeit);
$endzeit_format = date("Y-m-d",$endzeit);
$datearray[] = createDateRangeArray($startzeit_format,$endzeit_format);
}
This should be the merging code:
for($i = 0; $i<count($datearray); $i++)
{
$datesarray = array_merge($datearray[$i]);
}
Can anybody help?