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@ 2013-07-17T13:38:22Z

<?php
function getRoundedCutoff ($t) {
    list($hour, $min, $sec) = explode(':', $t);
        $rmin = $min % 15;
        $dt   = new DateTime( $t );

        if ( $sec > 30 ) {
            $dt = $dt->add(new DateInterval('PT'.(60-$sec).'M'));
        } else {
            $dt = $dt->sub(new DateInterval('PT'.$sec.'M'));
        }

        if ( $rmin > 7 ) {
            $dt = $dt->add(new DateInterval('PT'.(15-$rmin).'M'));
        } else {
            $dt = $dt->sub(new DateInterval('PT'.$rmin.'M'));
        }

        return $dt->format('H:i:s');
    }

$times = array(
    '10:52:00',
    '10:52:59',
    '10:53:00',
    '10:50:00',
    '10:50:14',
    '10:50:59',
    '10:50:45',
    '01:12:00',
    '01:05:00',
    '01:58:00',
    '01:58:59',
    '01:59:59',
    '01:01:00',
    );

foreach ($times as $time) {
	var_dump($time.' -> '.getRoundedCutoff($time));
}

Output for git.master, git.master_jit, rfc.property-hooks: string(20) "10:52:00 -> 10:45:00" string(20) "10:52:59 -> 10:46:59" string(20) "10:53:00 -> 11:00:00" string(20) "10:50:00 -> 10:45:00" string(20) "10:50:14 -> 10:31:14" string(20) "10:50:59 -> 10:46:59" string(20) "10:50:45 -> 11:00:45" string(20) "01:12:00 -> 01:15:00" string(20) "01:05:00 -> 01:00:00" string(20) "01:58:00 -> 02:00:00" string(20) "01:58:59 -> 02:01:59" string(20) "01:59:59 -> 02:01:59" string(20) "01:01:00 -> 01:00:00"

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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