Online PHP editor | output for 1NGgR

@ 2017-12-08T06:55:39Z

<?php

$month = '2';
$year = '2017';
$lastDayOfWeek = '7'; //1 (for monday) to 7 (for sunday)

function getWeeksInMonth($year, $month, $lastDayOfWeek, $format = 'Y/m/d')
{
    $aWeeksOfMonth = [];
    $date = new DateTime("{$year}-{$month}-01");
    $iDaysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $aOneWeek = [$date->format($format)];
    $weekNumber = 1;
    for ($i = 1; $i <= $iDaysInMonth; $i++)
    {
        if ($lastDayOfWeek == $date->format('N') || $i == $iDaysInMonth)
        {
            $aOneWeek[]      = $date->format($format);
            $aWeeksOfMonth[$weekNumber++] = $aOneWeek;
            $date->add(new DateInterval('P1D'));
            $aOneWeek = [$date->format($format)];
            $i++;

        }
        $date->add(new DateInterval('P1D'));
    }
    return $aWeeksOfMonth;
}

$weeks = getWeeksInMonth($year, $month, $lastDayOfWeek);

foreach($weeks as $weekNumber => $week){
    echo "Week {$weekNumber}: {$week[0]} - {$week[1]}\r\n";
}

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: Fatal error: Uncaught Error: Call to undefined function cal_days_in_month() in /in/1NGgR:11 Stack trace: #0 /in/1NGgR(30): getWeeksInMonth('2017', '2', '7') #1 {main} thrown in /in/1NGgR on line 11
Process exited with code 255.
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 5.6.0 - 5.6.40: Fatal error: Call to undefined function cal_days_in_month() in /in/1NGgR on line 11
Process exited with code 255.

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