mb_ucfirst

(PHP 8 >= 8.4.0)

mb_ucfirst — Make a string's first character uppercase

说明

mb_ucfirst(string $string, ?string $encoding = null): string

Performs a multi-byte safe ucfirst() operation, and returns a string with the first character of string title-cased.

参数

string: The input string.
encoding: The string encoding.

返回值

Returns the resulting string.

注释

注意:
By contrast to the standard case folding functions such as strtolower() and strtoupper(), case folding is performed on the basis of the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such a-umlaut (ä).

For more information about the Unicode properties, please see » http://www.unicode.org/reports/tr21/.

参见

mb_lcfirst() - Make a string's first character lowercase
mb_convert_case() - 对字符串进行大小写转换
ucfirst() - 将字符串的首字母转换为大写

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hans at loltek dot net ¶

3 months ago

polyfill:

<?php
if(PHP_VERSION_ID < 80400) {
function mb_ucfirst(string $str, string $encoding = null): string
{
    if ($encoding === null) {
$encoding = mb_internal_encoding();
    }
    return mb_strtoupper(mb_substr($str, 0, 1, $encoding), $encoding) . mb_substr($str, 1, null, $encoding);
}

}
?>

if you wonder why i bother with mb_internal_encoding: prior to php7, $encoding was not nullable. if your polyfill don't need php5.6 support, you can drop it.