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@ 2013-08-29T08:43:22Z

<?php

$dateMonth = '2013-09';

$dateFirstDay = new DateTime($dateMonth . '-01');
$dayOfWeekFirstDay = $dateFirstDay->format('w');

$nofDaysInMonth = $dateFirstDay->format('t');

$daysOfWeek = array(
    1 => 'Mon',
    2 => 'Tue',
    3 => 'Wed',
    4 => 'Thu',
    5 => 'Fri',
    6 => 'Sat',
    0 => 'Sun'
);


$currentDayOfWeek = $dayOfWeekFirstDay;

foreach($daysOfWeek as $dayName) {
    echo $dayName . "\t";
}

echo "\n";


if ($currentDayOfWeek != 1) {

	$skipFirstDays = (0 == $currentDayOfWeek ? 6 : $currentDayOfWeek-1);

    echo str_pad('', $skipFirstDays*2, "*\t");

}

for ($curDay = 1; $curDay <= $nofDaysInMonth; $curDay++, $currentDayOfWeek++) {

    if ($currentDayOfWeek == 7) {
		$currentDayOfWeek = 0;
    }


    $isWeekEnd = false;
    if ($currentDayOfWeek == 6 || $currentDayOfWeek == 0) {
		$isWeekEnd = true;
    }


    if (!$isWeekEnd) {
        echo $curDay . "\t";
    }
    else {
		echo "[" . $curDay . "]\t";
    }

    if ($currentDayOfWeek == 0) {
		echo "\n";
    }

}

Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Mon Tue Wed Thu Fri Sat Sun * * * * * * [1] 2 3 4 5 6 [7] [8] 9 10 11 12 13 [14] [15] 16 17 18 19 20 [21] [22] 23 24 25 26 27 [28] [29] 30
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Class 'DateTime' not found in /in/IdkBA on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9: Fatal error: Cannot instantiate non-existent class: datetime in /in/IdkBA on line 5
Process exited with code 255.
Output for 4.3.1: Fatal error: Cannot instantiate non-existent class: datetime in /in/IdkBA on line 5
Output for 4.3.0: Fatal error: Cannot instantiate non-existent class: datetime in /in/jmn8N on line 5

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