Issue adding data from csv to mysql using PHP - php

Question

I have a PHP code that is supposed to save values fro a CSV file into a MySql database table. Everything works fine except that only the first row of the CSV is added. Here's the code:
<?php
public function saveProductsFromCsv($productId, $val) {
$productId = (int) $productId;
$data = array();
$fieldNames = $this->_config->getCsvColumnNames();
array_shift($fieldNames);
$numberOfFields = count($fieldNames);
$lines = explode("\n", $val);
foreach ($lines as $line) {
$line = trim($line);
if (empty($line))
continue;
$values = explode(',', $line);
if (count($values) != $numberOfFields){
throw new Exception();
return;
}
$make = trim($values[0]);
$model = trim($values[1]);
$yearFrom = (int) $values[2];
$yearTo = (int) $values[3];
$engine = trim($values[4]);
if ($yearFrom > 0){
if ($yearFrom < 1950){
$yearFrom = 1950;
} elseif ($yearFrom > 2030){
$yearFrom = 2030;
}
}
if ($yearTo > 0){
if ($yearTo < 1950){
$yearTo = 1950;
} elseif ($yearTo > 2030){
$yearTo = 2030;
}
}
$data[] = array($productId, $make, $model, $yearFrom, $yearTo, $engine);
}
if (count($data) > 0){
$this->saveValues($data);
}
}
public function saveValues($data)
{
$valuesStr = '';
foreach ($data as $values){
$cell = '';
foreach ($values as $value)
$cell .= ",'" . esc_sql(trim($value)). "'";
$valuesStr .= ($valuesStr != '' ? ',' : '') . "(NULL{$cell})";
}
$this->_wpdb->query("INSERT IGNORE INTO {$this->_mainTable} VALUES {$valuesStr}");
}
?>
Below is the CSV:
product_sku,make,model,year_from,year_to,engine
63118,Toyota,FJ Cruiser,2000,2008,V6 4.7L 2UZ-FE 20R/22R 1st Gen FJ Cruiser
28216,Toyota,GX470,1992,1997,V8 4.7L 2UZ-FE GX470
62687,Toyota,Land Cruiser,1998,2007,V8 4.7L 2UZ-FE 100-Series
28485,Toyota,Land Cruiser,2007,2018,V8 5.7L 3UR-FE 200-Series
Incidentally, if I use this:
product_sku,make,model,year_from,year_to,engine
63118,Toyota,FJ Cruiser,2000,2008,engine1
28216,Toyota,GX470,1992,1997,engine2
62687,Toyota,Land Cruiser,1998,2007,engine3
28485,Toyota,Land Cruiser,2007,2018,engine4
everything gets inserted fine. I think the problem is with the last column because if I use the same values in the last column in the second or third columns, everything works fine.

Answer 1

Never mind, I've solved it. The problem was with the encoding of the CSV file. I changed it to UTF-8 and everything is working fine.