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@ 2013-11-18T21:56:42Z

<?php

function nextMonth($date, $increment)
{
    $firstOfDateMonth = \DateTime::createFromFormat('Y-m-01', $date);
    $thirtyFirstOfDateMonth = \DateTime::createFromFormat('Y-m-t', $date)->format('t');

    $thirtyFirstOfNextMonth = clone $firstOfDateMonth;
    $thirtyFirstOfNextMonth->modify('+' . (int) $increment . ' month')->format('t');

    $dayOfDateMonth = \DateTime::createFromFormat('Y-m-d', $date)->format('d');

    $dt = \DateTime::createFromFormat('Y-m-d', $date);
    $dt->modify('+' . (int) $increment . ' month');
    if ($thirtyFirstOfNextMonth < $thirtyFirstOfDateMonth && $thirtyFirstOfNextMonth < $dayOfDateMonth) {
		$dt = clone $firstOfDateMonth;
        $dt->modify('+' . (int) $increment . ' month +' . $thirtyFirstOfNextMonth);
    }

    return $dt->format('Y-m-d');
}
echo nextMonth('2009-12-31', 2),"\n";
echo nextMonth('2010-01-31', 1),"\n";
echo nextMonth('2010-01-05', 1),"\n";
echo nextMonth('2010-12-05', 1),"\n";

Output for git.master, git.master_jit: Fatal error: Uncaught Error: Call to a member function format() on bool in /in/9oHCL:6 Stack trace: #0 /in/9oHCL(22): nextMonth('2009-12-31', 2) #1 {main} thrown in /in/9oHCL on line 6
Process exited with code 255.
Output for rfc.property-hooks: Fatal error: Uncaught Error: Call to a member function format() on false in /in/9oHCL:6 Stack trace: #0 /in/9oHCL(22): nextMonth('2009-12-31', 2) #1 {main} thrown in /in/9oHCL on line 6
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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