略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: IntlChar::isJavaIDStart

2024-11-14

IntlChar::isJavaIDStart

(PHP 7, PHP 8)

IntlChar::isJavaIDStartCheck if code point is permissible as the first character in a Java identifier

说明

public static IntlChar::isJavaIDStart(int|string $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. Returns null on failure.

范例

示例 #1 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

add a noteadd a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址:https://www.php.net/manual/en/intlchar.isjavaidstart.php

北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3