IntlChar::isIDStart

(PHP 7, PHP 8)

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

Description

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).

Liste de paramètres

codepoint: La valeur codepoint de type entier (i.e. 0x2603 pour U+2603 SNOWMAN), ou le caractère encodé en UTF-8 de type chaîne de caractères (i.e. "\u{2603}")

Valeurs de retour

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

Exemples

Exemple #1 Test de différents codepoint

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

L'exemple ci-dessus va afficher :

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

Voir aussi

IntlChar::isalpha() - Check if code point is a letter character
IntlChar::isIDPart() - Check if code point is permissible in an identifier
IntlChar::PROPERTY_ID_START

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