(PHP 7, PHP 8)
IntlChar::isIDStart — Check if code point is permissible as the first character in an identifier
Determines 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).
Returns true
if
codepoint
may start an identifier, false
if not. Returns null
on failure.
Приклад #1 Тестування різних кодових точок
<?php
var_dump(IntlChar::isIDStart("A"));
var_dump(IntlChar::isIDStart("$"));
var_dump(IntlChar::isIDStart("\n"));
var_dump(IntlChar::isIDStart("\u{2603}"));
?>
Поданий вище приклад виведе:
bool(true) bool(false) bool(false) bool(false)
IntlChar::PROPERTY_ID_START