php unicode转为汉字

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function u2c($str){       return preg_replace_callback("#\\\u([0-9a-f]{4})#i",          function ($r) {         return iconv('UCS-2BE', 'UTF-8', pack('H4', $r[1]));},$str); }   echo u2c('\u53ea\u80fd\u4e2d\u6587\u624d\u61c2\u6211');