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<?php function html_asciify(string $utf8String): string { $iterator = IntlBreakIterator::createCodePointInstance(); $iterator->setText($utf8String); $result = ''; foreach ($iterator as $pos) { if ($pos === 0) { continue; } $codePoint = $iterator->getLastCodePoint(); $result .= $codePoint <= 127 ? chr($codePoint) : '&#x' . dechex($codePoint) . ';'; } return $result; } $result = html_asciify("aaaååddd仕事bbbb\x80aaaa"); var_dump($result, html_entity_decode($result));
Output for git.master, git.master_jit, rfc.property-hooks
string(50) "aaa&#xe5;&#xe5;ddd&#x4ed5;&#x4e8b;bbbb&#xfffd;aaaa" string(27) "aaaååddd仕事bbbb�aaaa"

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