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@ 2021-10-01T05:34:00Z

<?php

ini_set('date.timezone', 'GMT');

// Sun, 06 Nov 1994 08:49:37 GMT
$date = gmmktime(8, 49, 37, 11, 6, 1994);

function compare_date_format($date, $constant, $string) {
    $constant_date = date((defined($constant)) ? constant($constant) : '', $date);
    $string_date = date($string, $date);
    
    var_dump($constant, $constant_date, $string_date, $constant_date === $string_date);
}

compare_date_format($date, 'DATE_RFC822', 'D, j M y H:i:s O');
compare_date_format($date, 'DATE_RFC850', 'l, d-M-y H:i:s T');
compare_date_format($date, 'DATE_RFC1036', 'D, d M y H:i:s O');
compare_date_format($date, 'DATE_RFC1123', 'D, d M Y H:i:s O');
compare_date_format($date, 'DATE_RFC2109', 'D, d-M-y H:i:s T');
compare_date_format($date, 'DATE_COOKIE', 'D, d-M-Y H:i:s T');
compare_date_format($date, 'DATE_RFC2616', 'D, d M Y H:i:s \G\M\T');
//compare_date_format($date, 'DATE_RFC2965', '');
compare_date_format($date, 'DATE_RFC2822', 'D, j M Y H:i:s O');
compare_date_format($date, 'DATE_RFC5322', 'D, j M Y H:i:s O');
compare_date_format($date, 'DATE_RFC6265', 'D, d M Y H:i:s \G\M\T');
compare_date_format($date, 'DATE_RFC7231', 'D, d M Y H:i:s \G\M\T');

Output for git.master, git.master_jit, rfc.property-hooks: string(11) "DATE_RFC822" string(29) "Sun, 06 Nov 94 08:49:37 +0000" string(28) "Sun, 6 Nov 94 08:49:37 +0000" bool(false) string(11) "DATE_RFC850" string(30) "Sunday, 06-Nov-94 08:49:37 GMT" string(30) "Sunday, 06-Nov-94 08:49:37 GMT" bool(true) string(12) "DATE_RFC1036" string(29) "Sun, 06 Nov 94 08:49:37 +0000" string(29) "Sun, 06 Nov 94 08:49:37 +0000" bool(true) string(12) "DATE_RFC1123" string(31) "Sun, 06 Nov 1994 08:49:37 +0000" string(31) "Sun, 06 Nov 1994 08:49:37 +0000" bool(true) string(12) "DATE_RFC2109" string(0) "" string(27) "Sun, 06-Nov-94 08:49:37 GMT" bool(false) string(11) "DATE_COOKIE" string(32) "Sunday, 06-Nov-1994 08:49:37 GMT" string(29) "Sun, 06-Nov-1994 08:49:37 GMT" bool(false) string(12) "DATE_RFC2616" string(0) "" string(29) "Sun, 06 Nov 1994 08:49:37 GMT" bool(false) string(12) "DATE_RFC2822" string(31) "Sun, 06 Nov 1994 08:49:37 +0000" string(30) "Sun, 6 Nov 1994 08:49:37 +0000" bool(false) string(12) "DATE_RFC5322" string(0) "" string(30) "Sun, 6 Nov 1994 08:49:37 +0000" bool(false) string(12) "DATE_RFC6265" string(0) "" string(29) "Sun, 06 Nov 1994 08:49:37 GMT" bool(false) string(12) "DATE_RFC7231" string(29) "Sun, 06 Nov 1994 08:49:37 GMT" string(29) "Sun, 06 Nov 1994 08:49:37 GMT" bool(true)

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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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