PHP Conference Japan 2024

mb_ucfirst

(PHP 8 >= 8.4.0)

mb_ucfirstMake 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

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hans at loltek dot net
14 days 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.
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