intl_get_error_message() broken after MessageFormatter::formatMessage() fails

[TimWolla]

Description

The following code:

<?php
var_dump(\MessageFormatter::formatMessage('en', 'some message with {invalid format}', []), intl_get_error_message());
var_dump(\MessageFormatter::formatMessage('en', 'some {wrong.format}', []), intl_get_error_message());

Resulted in this output:

bool(false)
string(12) "U_ZERO_ERROR"
bool(false)
string(12) "U_ZERO_ERROR"

But I expected this output instead:

bool(false)
string(128) "pattern syntax error (parse error at offset 19, after " message with {", before or at "invalid format}"): U_PATTERN_SYNTAX_ERROR"
bool(false)
string(116) "pattern syntax error (parse error at offset 6, after "some {", before or at "wrong.format}"): U_PATTERN_SYNTAX_ERROR"

see: https://onlinephp.io?s=s7EvyCjg5SpLLIpPKc0t0IjxTS0uTkxPdcsvyk0sKUktsrJKAzOh4hrqqXnqOgrqxfm5qQq5EDGF8sySDIXqzLyyxJzMFAWI-lqgquhYTR2FzLySnPj01JL41KKi_KJ4qB4NTU1rcq2tLi_Kz0vXI8EeAA%2C%2C&v=8.2.9%2C8.1.22%2C8.0.30%2C8.2.8%2C8.1.21

PHP Version

PHP 8.2.9

Operating System

No response

[TimWolla]

I suspect this regressed in 536dbd7, but did not test.

[TimWolla]

/cc @Girgias who authored the commit above.