unset all elements of an array and resue it in php - php

Question

i used unset method to empty my array it does but when i initilize same array again to reuse it in my code it gives the fatal error
Unsupported operand types
although other unset are working fine but only one array with integer type values have problem.
Any kind of help would be appreciated
here is my piece of code:
<?php
for ($citycount = 0; $citycount < $count; $citycount ++) {
$loc_qry = "SELECT `ID` as LocationID, `name` as LocationName FROM `territories` where `formatID` = 43 and `territorylevelID` = 77 and `parentID` = '" . $cityID_arr[$citycount] . "'";
$loc_qry_res = mysql_query($loc_qry) or die($loc_qry . "<br><br>" . mysql_error());
while ($rs_loc = mysql_fetch_array($loc_qry_res)) {
$location_id_arr[] = $rs_loc['LocationID'];
$location_name_arr [] = $rs_loc['LocationName'];
}
$count_loc = count($location_id_arr);
for ($i = 0; $i < $count_loc; $i++) {
$location_scores = "SELECT ((SUM(sa.achievedScore) / SUM(sa.totalScore)) * 100) as Score
FROM `scoreanalysis` as sa
WHERE `formatID` = 43 and `waveID` = '" . $wave_id_arr[0] . "' and `territoryID` = '" . $location_id_arr[$i] . "'";
$location_scores_res = mysql_query($location_scores);
while ($res_location_score = mysql_fetch_array($location_scores_res)) {
$location_scores_arr[] = intval($res_location_score['Score']);
}
if ($location_scores_arr[$i] != NULL) {
$divider = $divider + 1;
}
$cityscore = $cityscore + $location_scores_arr[$i];
//echo $location_id_arr[$i];
//echo $location_name_arr[$i]."<br>";
}
$total = $cityscore / $divider;
$city_qry = "SELECT `ID` as cityID, `name` as cityName FROM `territories` where `ID` = '" . $cityID_arr[$citycount] . "'";
$city_qry_rs = mysql_query($city_qry) or die($city_qry . "<br><br>" . mysql_error());
while ($city_name = mysql_fetch_array($city_qry_rs)) {
$cityname = $city_name['cityName'];
}
echo $cityname;
echo intval($total) . "%";
$total = 0;
$cityscore = 0;
unset($location_id_arr);
unset($location_name_arr);
$location_id_arr[] = array();
$location_name_arr[] = array();
unset($location_scores_arr);
$location_scores_arr[] = array();
$city_scores_arr [] = intval($total);
}
?>

Answer 1

The [] syntax is for adding an element to the end of an array; it's not valid for a variable you have just unset. Instead of trying to clear the array at the end of each iteration of the loop, you should be creating a new array at the beginning of each iteration, i.e.:
for ($citycount = 0; $citycount< $count; $citycount ++)
{
$location_id_arr = array();
$location_name_arr = array();
$location_scores_arr = array();
$loc_qry = "SELECT `ID` as LocationID, `name` as LocationName FROM `territories` where `formatID` = 43 and `territorylevelID` = 77 and `parentID` = '".$cityID_arr[$citycount]."'";
$loc_qry_res = mysql_query($loc_qry) or die($loc_qry."<br><br>".mysql_error());
...
}