(PHP 7, PHP 8)
IntlChar::isupper — Check if code point has the general category "Lu" (uppercase letter)
$codepoint): ?boolDetermines whether the specified code point has the general category "Lu" (uppercase letter).
Nota:
This misses some characters that are also uppercase but have a different general category value. In order to include those, use IntlChar::isUUppercase().
codepointO valor int do ponto de código (por exemplo, 0x2603 para U+2603 SNOWMAN) ou o caractere codificado como uma string UTF-8 (por exemplo, "\u{2603}")
Returns true if
codepoint is an Lu uppercase letter, false if not. Returns null on failure.
Exemplo #1 Testando diferentes pontos de código
<?php
var_dump(IntlChar::isupper("A"));
var_dump(IntlChar::isupper("a"));
var_dump(IntlChar::isupper("Φ"));
var_dump(IntlChar::isupper("φ"));
var_dump(IntlChar::isupper("1"));
?>
O exemplo acima produzirá:
bool(true) bool(false) bool(true) bool(false) bool(false)
IntlChar::PROPERTY_UPPERCASE