(PHP 7, PHP 8)
IntlChar::islower — Check if code point is a lowercase letter
$codepoint): ?boolDetermines whether the specified code point has the general category "Ll" (lowercase letter).
Nota:
This misses some characters that are also lowercase but have a different general category value. In order to include those, use IntlChar::isULowercase().
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 Ll lowercase letter, false if not. Returns null on failure.
Exemplo #1 Testando diferentes pontos de código
<?php
var_dump(IntlChar::islower("A"));
var_dump(IntlChar::islower("a"));
var_dump(IntlChar::islower("Φ"));
var_dump(IntlChar::islower("φ"));
var_dump(IntlChar::islower("1"));
?>O exemplo acima produzirá:
bool(false) bool(true) bool(false) bool(true) bool(false)
IntlChar::PROPERTY_LOWERCASE