Php/docs/intlchar.isidstart

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

IntlChar::isIDStart

(PHP 7)

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

说明

public static IntlChar::isIDStart ( mixed $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).

参数

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}")

返回值

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

范例

Example #1 Testing different code points

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

以上例程会输出：

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

参见

• 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