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@ 2015-11-01T13:47:06Z

<?php

/**
 * @param string $start
 * @param string $end
 * 
 * @return string[]
 */
function date_period_grid($start, $end)
{
    $start = new DateTime($start);
    $end   = new DateTime($end);
    
    $i = $end->diff($start);

	$days   = $i->days;
	$months = $i->y * 12 + $i->m + ($i->d ? 1 : 0);
	$years  = $i->y + (($i->m || $i->d) ? 1 : 0);
	
    if ($years > 1) {
    	$period = new DatePeriod($start, new DateInterval('P1Y'), $years);
    } elseif ($months > 1) {
    	$period = new DatePeriod($start, new DateInterval('P1M'), $months);
    } else {
    	$period = new DatePeriod($start, new DateInterval('P1D'), $days);
    }
    
    $result = [];
    foreach ($period as $date) {
        $result[] = $date->format('Y-m-d');
    }
    
    return $result;
}

var_dump(date_period_grid('2012-07-01', '2015-11-01'));

Output for git.master, git.master_jit, rfc.property-hooks: array(5) { [0]=> string(10) "2012-07-01" [1]=> string(10) "2013-07-01" [2]=> string(10) "2014-07-01" [3]=> string(10) "2015-07-01" [4]=> string(10) "2016-07-01" }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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