(PHP 7, PHP 8)
IntlChar::isIDStart — Check if code point is permissible as the first character in an identifier
$codepoint
): ?boolDetermines if the specified character is permissible as the first character in an identifier according to Unicode (The Unicode Standard, Version 3.0, chapter 5.16 Identifiers).
true
for characters with general categories "L" (letters) and "Nl" (letter numbers).
codepoint
O valor int do ponto de código (por exemplo, 0x2603
para U+2603 SNOWMAN) ou o caractere codificado como uma string UTF-8 (por exemplo, "\u{2603}"
).
Returns true
if
codepoint
may start an identifier, false
if not. Returns null
on failure.
Exemplo #1 Testando diferentes pontos de código
<?php
var_dump(IntlChar::isIDStart("A"));
var_dump(IntlChar::isIDStart("$"));
var_dump(IntlChar::isIDStart("\n"));
var_dump(IntlChar::isIDStart("\u{2603}"));
?>
O exemplo acima produzirá:
bool(true) bool(false) bool(false) bool(false)
IntlChar::PROPERTY_ID_START