How to throw custom exception in php while parsing csv files? - php

Question

I'm writing php code to parse a csv file. I have to validate the basic data type for all the fields in the csv fileds and should throw an instance of a CsvParserException if there is any broken data in the csv file. I've given a generic exception but I want to give a custom exception which is an instance of CsvParserException.
Below is my code. I'm not sure how to to properly handle this.
<?php
namespace app;
class CsvParser{
public function parse() {
$row = 1;
$flag = true;
if (($handle = fopen("file.csv", "r")) !== FALSE) {
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$num = count($data);
echo "<p> $num fields in line $row: <br /></p>\n";
echo $num;
$row++;
if($flag) { $flag = false; continue; } // this is to skip the first line
for ($c=0; $c < $num; $c++) {
echo "data[0] is = ". $data[0] . " data[c] is = ". $data[$c]. " <br />\n";
if(!((isset($data[0])) && (is_numeric($data[0])))) {
throw new \Exception('Id is not valid');
}
if(!((isset($data[1])) && (is_string($data[1])))) {
throw new \Exception('This is not a valid string. ');
}
if(!((isset($data[2])) && (is_string($data[2])))) {
throw new \Exception('This is not a valid string. ');
}
$date = strtotime($data[3]);
$splitData = explode('|', $data[4]);
foreach($splitData as $value) {
if(!((isset($value)) && (is_numeric($value)))) {
throw new \Exception('Integers is not valid');
}
}
}
}
fclose($handle);
}
}
}
?>
Can someone please help ?