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<?php $tests = array( html_entity_decode('&#xd800;&#xdc00;', ENT_NOQUOTES, 'utf-8'), html_entity_decode('&#x1D11E;') ); foreach ($tests as $s) { var_dump($s); var_dump(json_encode($s)); var_dump(json_encode($s, JSON_UNESCAPED_UNICODE)); }

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35.11 ms | 402 KiB | 5 Q