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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)); }
Output for git.master, git.master_jit, rfc.property-hooks
string(16) "&#xd800;&#xdc00;" string(18) ""&#xd800;&#xdc00;"" string(18) ""&#xd800;&#xdc00;"" string(4) "𝄞" string(14) ""\ud834\udd1e"" string(6) ""𝄞""

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