MySQL DB Upload Failure & Undefined Offset Error - php

Question

Hellos.
Assist me with two queries in the file below intended to upload CSV files
Failing to upload to a MySQL without logging errors (Am I missing folder/file permissions?)
"Undefined offset" error from anything after column 10 in CSV (Is there a limit I declared unknowingly?)
Thank You.
if(isset($_POST['import'])){
$csvMimes = array('text/x-comma-separated-values',
'text/comma-separated-values',
'application/octet-stream',
'application/vnd.ms-excel',
'application/x-csv',
'text/x-csv', 'text/csv',
'application/csv',
'application/excel',
'application/vnd.msexcel',
'text/plain');
if(!empty($_FILES['file']['name'])
&& in_array($_FILES['file']['type'], $csvMimes))
{
if(is_uploaded_file($_FILES['file']['tmp_name'])){
$csvFile = fopen($_FILES['file']['tmp_name'], 'r');
fgetcsv($csvFile);
while(($line = fgetcsv($csvFile)) !== FALSE){
$ColID = $line[0];
$Col02 = $line[1];
$Col03 = $line[2];
$Col04 = $line[3];
$Col05 = $line[4];
$Col06 = $line[5];
$Col07 = $line[6];
$Col08 = $line[7];
$Col09 = $line[8];
$Col010 = $line[9];
$Col0n = $line[10];
$prevQuery = "SELECT id
FROM table_name
WHERE ColID = '".$line[0]."'";
$prevResult = $db->query($prevQuery);
if($prevResult){
if($prevResult->num_rows > 0){
$db->query("UPDATE table_name
SET ColHdg02 = '".$Col02."',
ColHdg03 = '".$Col03."',
ColHdg04 = '".$Col04."',
ColHdg05 = '".$Col05."',
ColHdg06 = '".$Col06."',
ColHdg07 = '".$Col07."',
ColHdg08 = '".$Col08."',
ColHdg09 = '".$Col09."',
ColHdg010 = '".$Col010."',
ColHdg0n = '".$Col0n."'
WHERE ColIDHdg = '".$ColID."'");
} else{
$db->query("INSERT INTO table_name
(ColIDHdg, ColHdg02, ColHdg03, ColHdg04,
ColHdg05, ColHdg06, ColHdg07, ColHdg08,
ColHdg09, ColHdg010, ColHdg0n)
VALUES ('".$ColID."', '".$Col02."', '".$Col03."',
'".$Col04."', '".$Col05."', '".$Col06."',
'".$Col07."', '".$Col08."', '".$Col09."',
'".$Col010."', '".$Col0n."')");
}
}
}
fclose($csvFile);

Answer 1

You're trying to get an Undefined offset, for your example please check if the number of items on $line is 11 or more.
if (count($line) > 10) {
$ColID = $line[0];
$Col02 = $line[1];
$Col03 = $line[2];
$Col04 = $line[3];
$Col05 = $line[4];
$Col06 = $line[5];
$Col07 = $line[6];
$Col08 = $line[7];
$Col09 = $line[8];
$Col010 = $line[9];
$Col0n = $line[10];
$prevQuery = "SELECT id FROM table_name WHERE ColID = '" . $line[0] . "'";
$prevResult = $db->query($prevQuery);
if ($prevResult) {
if ($prevResult->num_rows > 0) {
$db->query("UPDATE table_name SET ColHdg02 = '" . $Col02 . "', ColHdg03 = '" . $Col03 . "', ColHdg04 = '" . $Col04 . "', ColHdg05 = '" . $Col05 . "', ColHdg06 = '" . $Col06 . "', ColHdg07 = '" . $Col07 . "', ColHdg08 = '" . $Col08 . "', ColHdg09 = '" . $Col09 . "', ColHdg010 = '" . $Col010 . "', ColHdg0n = '" . $Col0n . "' WHERE ColIDHdg = '" . $ColID . "'");
} else {
$db->query("INSERT INTO table_name (ColIDHdg, ColHdg02, ColHdg03, ColHdg04, ColHdg05, ColHdg06, ColHdg07, ColHdg08, ColHdg09, ColHdg010, ColHdg0n) VALUES ('" . $ColID . "', '" . $Col02 . "', '" . $Col03 . "', '" . $Col04 . "', '" . $Col05 . "', '" . $Col06 . "', '" . $Col07 . "', '" . $Col08 . "', '" . $Col09 . "', '" . $Col010 . "', '" . $Col0n . "')");
}
}
}