IntlChar::isIDStart

(PHP 7, PHP 8)

IntlChar::isIDStartCheck if code point is permissible as the first character in an identifier

Descrizione

public static IntlChar::isIDStart(int|string $codepoint): ?bool

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).

Elenco dei parametri

codepoint

The int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")

Valori restituiti

Returns true if codepoint may start an identifier, false if not. Returns null on failure.

Esempi

Example #1 Testing different code points

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

Il precedente esempio visualizzerĂ :

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

Vedere anche:

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top