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<?php $json['AVAILABLE_ROLE']=array(); $json['asd']=""; $json['qwe']=array("IDHtmlCode"=>"25","inputHtmlCode"=>'as"d'); print_r((json_encode($json,JSON_HEX_QUOT))); ?>
Output for 5.3.0 - 7.1.0
{"AVAILABLE_ROLE":[],"asd":"","qwe":{"IDHtmlCode":"25","inputHtmlCode":"as\u0022d"}}