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@ 2014-04-20T10:28:48Z

<?php

$posts = array(
            array('post_id' => 7, 'timestamp' => '2014-04-20 20:17:49'),
            array('post_id' => 6, 'timestamp' => '2014-04-07 20:17:49'),
            array('post_id' => 5, 'timestamp' => '2014-03-17 20:17:49'),
            array('post_id' => 4, 'timestamp' => '2014-02-14 20:17:49'),
            array('post_id' => 3, 'timestamp' => '2014-01-09 20:17:49'),
            array('post_id' => 2, 'timestamp' => '2013-09-23 20:17:49'),
            array('post_id' => 1, 'timestamp' => '2012-09-23 20:17:49')
        );

$today = strtotime(date("Y-m-d"));
$week_start = strtotime('last sunday', strtotime('tomorrow'));
$month_start = strtotime(date_create(date("Y-m-d"))->modify('first day of this month')->format("Y-m-d"));
$year_start = strtotime(date_create(date("Y-m-d"))->modify('first day of january 2014')->format("Y-m-d"));

foreach ($posts as $post)
{
	$item = strtotime($post['timestamp']);
	
	if ($item >= $today)
	{
		// Today
		echo '<br><br>' . 'Today' . '<br>';
		echo $post['post_id'] . '<br>';
	}
	else if (($item <= $today) && ($item >= $week_start))
	{
		// This week
		echo '<br><br>' . 'This week' . '<br>';
		echo $post['post_id'] . '<br>';
	}
	else if (($item <= $week_start) && ($item >= $month_start))
	{
		// This week
		echo '<br><br>' . 'This month' . '<br>';
		echo $post['post_id'] . '<br>';
	}
	else if (($item <= $month_start) && ($item >= $year_start))
	{
		// This week
		echo '<br><br>' . 'This year' . '<br>';
		echo $post['post_id'] . '<br>';
	}
}

Output for 5.3.6 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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: <br><br>Today<br>7<br><br><br>This month<br>6<br><br><br>This year<br>5<br><br><br>This year<br>4<br><br><br>This year<br>3<br>
Output for 5.3.0 - 5.3.5: <br><br>Today<br>7<br><br><br>This month<br>6<br>
Output for 5.2.13 - 5.2.17: Warning: DateTime::modify(): Failed to parse time string (first day of this month) at position 10 (o): The timezone could not be found in the database in /in/pCFt6 on line 15 Fatal error: Call to a member function format() on a non-object in /in/pCFt6 on line 15
Process exited with code 255.
Output for 5.2.0 - 5.2.12: Fatal error: Call to a member function format() on a non-object in /in/pCFt6 on line 15
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Call to undefined function date_create() in /in/pCFt6 on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/pCFt6 on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/pCFt6 on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/pCFt6 on line 15
Process exited with code 255.

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