Single quoting in MessageFormatter

[naturefund-falk]

Description

The following code:

<?php declare(strict_types=1);

$formatter = new \MessageFormatter('en', "Quoting problem '{replace}'\n");
echo $formatter->format(['replace' => 'REPLACEMENT']);

Resulted in this output:

Quoting problem {replace}

But I expected this output instead:

Quoting problem 'REPLACEMENT'

Whats also not working is "Quoting problem '{replace}\n"

It works with "Quoting problem {replace}'\n" or with no or double quotes.

PHP Version

PHP 8.2.26, ICU version 72.1

Operating System

Debian 12

[cmb69]

Looks like intentional behavior: https://unicode-org.github.io/icu/userguide/format_parse/messages/#quotingescaping

[MorganLOCode]

Indeed, to get the intended result the apostrophes need to be escaped by doubling:

$formatter = new \MessageFormatter('en', "Quoting problem ''{replace}''\n");