Basic program to send desktop notifications in Ubuntu

check-premium.bash

#!/bin/bash

COUNT=`php /etc/checkDuePremium.php`

if [ $COUNT -gt 0 ]
then
    notify-send 'Hello Kuntal!' "$COUNT premium is due. Check your inbox for details" --icon=dialog-information
    echo insurance reminder job ran at  `date` >> /var/log/custom.log
fi

checkDuePremium.php

<?php
//basic example to send email using sSMTP and respond to a bash script
$set = [
    'Test' => [8 => [4000, 5000]],
    'Test1' => [3 => [1234], 12 => [5678, 9012]],
    'Test2' => [9 => [1000, 2000]],
    ];
$month = date('n');
$to = '[email protected]';
$premiumCount = 0;
$totalPremium = 0;

foreach ($set as $type => $values) {
    $subject = 'Premium is due: ';
    $months = array_keys($values);    

    if (in_array($month, $months)) {
        $sum = array_sum($values[$month]);
        $totalPremium += $sum;
        $premiumCount = count($values[$month]);
        $subject .= $type;
        $message = "There are " . $premiumCount . " due premium(s)\n of total Rs. $sum";
        
        mail($to, $subject, $message);
    }
}

echo $premiumCount;