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@ 2021-08-06T09:51:45Z

<?php
/**
 * @link https://stackoverflow.com/a/13129856/367456
 */

$formats = array(
    'today midnight',
    'midnight',
    'today',
    'TODAY',
    'MidNight',
    'ToDaY',
    'tomorrow',
    'UTC today',
    'today Z',
    'today Europe/Berlin',
    'Asia/Shanghai today',
    'Asia/Shanghai',
    'HKST today',
);

/**
 * give each time (unix timestamp) its own color
 *
 * @param $time
 * @return string
 */
function time_color($time) {
    static $colors = array('black', 'copper', 'blue', 'lime', 'green', 'pink', 'red');
    static $coloredTime = array(-1 => '  ?!  ');
    if (!isset($coloredTime[$time])) {
        $coloredTime[$time] = array_pop($colors);
    }
    return $coloredTime[$time];
}

$time = strtotime('UTC 2020-01-01 00:00:00');

$format1 = "(default time-zone is ..: %s)\n";
if (is_callable('date_default_timezone_get')) {
    printf($format1, date_default_timezone_get());
} else {
    printf($format1, '??? (unknown)');
}

printf("UTC time is ............: [%-6s] %d (script-time, UTC 2020-01-01 00:00:00)\n", time_color($time), $time);

foreach ($formats as $format) {
    $strToTime = strtotime($format, $time);
    printf("%'.-24s: [%-6s] %d\n", "$format ", time_color($strToTime), $strToTime);
}

Output for git.master, git.master_jit, rfc.property-hooks: (default time-zone is ..: Europe/Amsterdam) UTC time is ............: [red ] 1577836800 (script-time, UTC 2020-01-01 00:00:00) today midnight .........: [pink ] 1577833200 midnight ...............: [pink ] 1577833200 today ..................: [pink ] 1577833200 TODAY ..................: [pink ] 1577833200 MidNight ...............: [pink ] 1577833200 ToDaY ..................: [pink ] 1577833200 tomorrow ...............: [green ] 1577919600 UTC today ..............: [red ] 1577836800 today Z ................: [red ] 1577836800 today Europe/Berlin ....: [pink ] 1577833200 Asia/Shanghai today ....: [lime ] 1577808000 Asia/Shanghai ..........: [blue ] 1577811600 HKST today .............: [copper] 1577804400

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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