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@ 2020-01-27T02:07:51Z

<?php

$tests = ['âa', 'Bbbbb', 'Éé', 'iou', 'Δδ'];
$tests[] = 'ⅷ';
$tests[] = 'Ⅷ';

foreach ($tests as $test) {
    echo "\n{$test}:";
    echo "\n\thasLetterVariants: " , preg_match('~^\p{L&}~u', $test) ? 'yes' : 'no';
    echo "\n\tPREG (ext): " , preg_match('~^\p{Lu}~u', $test)      ? 'upper' : 'not upper';
    echo "\n\tPREG:    " , preg_match('~^[\p{Lu}\x{2160}-\x{216F}]~u', $test) ? 'upper' : 'not upper';    echo "\n\tCTYPE:   " , ctype_upper(mb_substr($test, 0, 1))  ? 'upper' : 'not upper';
    echo "\n\t< a:     " , mb_substr($test, 0, 1) < 'a'         ? 'upper' : 'not upper';

    $chr = mb_substr ($test, 0, 1, "UTF-8");
    echo "\n\tMB:      " , mb_strtoupper($chr, "UTF-8") == $chr ? 'upper' : 'not upper';

    echo "\n\tIntlChar:" , IntlChar::isUUppercase(mb_substr($test, 0, 1)) ? 'upper' : 'not upper';
}

Output for git.master, git.master_jit, rfc.property-hooks: âa: hasLetterVariants: yes PREG (ext): not upper PREG: not upper CTYPE: not upper < a: not upper MB: not upper IntlChar:not upper Bbbbb: hasLetterVariants: yes PREG (ext): upper PREG: upper CTYPE: upper < a: upper MB: upper IntlChar:upper Éé: hasLetterVariants: yes PREG (ext): upper PREG: upper CTYPE: not upper < a: not upper MB: upper IntlChar:upper iou: hasLetterVariants: yes PREG (ext): not upper PREG: not upper CTYPE: not upper < a: not upper MB: not upper IntlChar:not upper Δδ: hasLetterVariants: yes PREG (ext): upper PREG: upper CTYPE: not upper < a: not upper MB: upper IntlChar:upper ⅷ: hasLetterVariants: no PREG (ext): not upper PREG: not upper CTYPE: not upper < a: not upper MB: not upper IntlChar:not upper Ⅷ: hasLetterVariants: no PREG (ext): not upper PREG: upper CTYPE: not upper < a: not upper MB: upper IntlChar:upper

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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