IntlChar::isJavaIDStart()

版本：php7

(PHP 7)

Check if code point is permissible as the first character in a Java identifier

说明

publicstaticIntlChar::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 integer codepoint value(e.g.0x2603forU+2603 SNOWMAN), or the character encoded as a UTF-8 string(e.g."u{2603}")

返回值

Returns TRUE if$codepointmay start a Java identifier,FALSE if not.

范例

Testing different code points

<?php
var_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