IntlChar::toupper

(PHP 7, PHP 8)

IntlChar::toupper — Make Unicode character uppercase

说明

public static IntlChar::toupper(int|string $codepoint): int|string|null

The given character is mapped to its uppercase equivalent. If the character has no uppercase equivalent, the character itself is returned.

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 the Simple_Uppercase_Mapping of the code point, if any; otherwise the code point itself.

返回类型是 int，如果代码点作为 UTF-8 string 传递，则会返回 string 。失败时返回 null。

示例

示例 #1 Testing different code points

<?php
var_dump(IntlChar::toupper("A"));
var_dump(IntlChar::toupper("a"));
var_dump(IntlChar::toupper("Φ"));
var_dump(IntlChar::toupper("φ"));
var_dump(IntlChar::toupper("1"));
var_dump(IntlChar::toupper(ord("A")));
var_dump(IntlChar::toupper(ord("a")));
?>

以上示例会输出：

string(1) "A"
string(1) "A"
string(2) "Φ"
string(2) "Φ"
string(1) "1"
int(65)
int(65)

参见

IntlChar::tolower() - Make Unicode character lowercase
IntlChar::totitle() - Make Unicode character titlecase
mb_strtoupper() - 使字符串大写

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