11

function myEncode($str){

    $arrReturn=array();

    for($i=0;$i

        $a=dechex(ord($str{$i}));

        for($j=0;$j

            $char=$a{$j};

            if($char>='a'){//是字母

                $arrReturn[]=chr(ord($char)+10);

            }else{

                //是数字

                //0->a,1->b,2->c ,3->d

                //即chr(ord($char)-ord('0')+ord('a')); //=chr(ord($char)-48+97)

                //=chr(ord($char+49)

                $arrReturn[]=chr(ord($char)+49);

            }

        }

    }

    return implode('',$arrReturn);

}

echo myEncode('苹果').'
';//oiilljogjojm

function myDecode($str){ 

    $chinese=array();

    for($i=0;$i

        $arr=array();

        for($j=0;$j<2;$j++){

            $char=$str{$i+$j};

            //107=ord('a')+10

            $arr[]= ord($char)>=107 ? chr(ord($char)-10):chr(ord($char)-49);

        }

        $chinese[]= chr(hexdec($arr[0].$arr[1]));

    } 

    return implode('',$chinese);

} 

echo myDecode('oiilljogjojm');//苹果