Php/docs/intlchar.isjavaidstart

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

IntlChar::isJavaIDStart

(PHP 7)

IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier

说明

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

Determines if the specified character is permissible as the start of a Java identifier.

In addition to IntlChar::isIDStart(), true for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).

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 a Java identifier, false if not.

范例

Example #1 Testing different code points

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

以上例程会输出：

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

参见

• IntlChar::isIDStart() - Check if code point is permissible as the first character in an identifier
• IntlChar::isJavaIDPart() - Check if code point is permissible in a Java identifier
• IntlChar::isalpha() - Check if code point is a letter character