IntlChar
PHP Manual

IntlChar::isIDStart

(PHP 7)

IntlChar::isIDStart — Check if code point is permissible as the first character in an identifier

Descrição

public static bool IntlChar::isIDStart ( mixed $codepoint )

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).

Parâmetros

codepoint

Um codepoint integer (por exemplo 0x2603 para U+2603 SNOWMAN), ou um caracter codificado como uma string UTF-8 (exemplo "\u{2603}")

Valor Retornado

Returns TRUE if codepoint may start an identifier, FALSE if not.

Exemplos

Exemplo #1 Testando codepoints diferentes

<?php
var_dump(IntlChar::isIDStart("A"));
var_dump(IntlChar::isIDStart("$"));
var_dump(IntlChar::isIDStart("\n"));
var_dump(IntlChar::isIDStart("\u{2603}"));
?>

O exemplo acima irá imprimir:

bool(true)
bool(false)
bool(false)
bool(false)

Veja Também

IntlChar
PHP Manual