update : 2015.11.03
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Check if code point is permissible as the first character in an identifier
IntlChar
PHP Manual

IntlChar::isIDStart

(PHP 7)

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

설명

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).

인수

codepoint

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

반환값

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

예제

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}"));
?>

위 예제의 출력:

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

참고

IntlChar
PHP Manual